When is a fetus fully formed
Fetal development: Month-By-Month Stages of Pregnancy
When does a pregnancy start?
The start of pregnancy is actually the first day of your last menstrual period. This is called the gestational age, or menstrual age. It’s about two weeks ahead of when conception actually occurs. Though it may seem strange, the date of the first day of your last period will be an important date when determining your due date. Your healthcare provider will ask you about this date and will use it to figure out how far along you are in your pregnancy.
How does conception work?
Each month, your body goes through a reproductive cycle that can end in one of two ways. You will either have a menstrual period or become pregnant. This cycle is continuously happening during your reproductive years — from puberty in your teen years to menopause around age 50.
In a cycle that ends with pregnancy, there are several steps. First, a group of eggs (called oocytes) gets ready to leave the ovary for ovulation (release of the egg). The eggs develop in small, fluid-filled cysts called follicles. Think of these follicles as small containers for each immature egg. Out of this group of eggs, one will become mature and continue on through the cycle. This follicle then suppresses all the other follicles in the group. The other follicles stop growing at this point.
The mature follicle now opens and releases the egg from the ovary. This is ovulation. Ovulation generally happens about two weeks before your next menstrual period begins. It’s generally in the middle of your cycle.
After ovulation, the opened (ruptured) follicle develops into a structure called the corpus luteum. This secretes (releases) the hormones progesterone and estrogen. Progesterone helps prepare the endometrium (lining of the uterus). This lining is the place where a fertilized egg settles to develop. If you don’t become pregnant during a cycle, this lining is what is shed during your period.
On average, fertilization happens about two weeks after your last menstrual period.
When the sperm penetrates the egg, changes occur in the protein coating of the egg to prevent other sperm from entering.
At the moment of fertilization, your baby’s genetic make-up is complete, including its sex. The sex of your baby depends on what sperm fertilizes the egg at the moment of conception. Generally, women have a genetic combination of XX and men have XY. Women provide each egg with an X. Each sperm can be either an X or a Y. If the fertilized egg and sperm is a combination of an X and Y, it’s a boy. If there are two Xs, it’s a girl.
What happens right after conception?
Within 24 hours after fertilization, the egg begins rapidly dividing into many cells. It remains in the fallopian tube for about three days after conception. Then the fertilized egg (now called a blastocyte) continues to divide as it passes slowly through the fallopian tube to the uterus. Once there, its next job is to attach to the endometrium. This is called implantation.
Before implantation though, the blastocyte breaks out of its protective covering.
When the blastocyte makes contact with the endometrium, the two exchange hormones to help the blastocyte attach. Some women notice spotting (slight bleeding) during the one or two days when implantation happens. This is normal and isn’t something you should worry about. At this point, the endometrium becomes thicker and the cervix (the opening between your uterus and birth canal) is sealed by a plug of mucus.
Within three weeks, the blastocyte cells ultimately form a little ball, or an embryo. By this time, the first nerve cells have formed.
Your developing fetus has already gone through a few name changes in the first few weeks of pregnancy. Generally, it's called an embryo from conception until the eighth week of development. After the eighth week, it's called a fetus until it’s born.
How early can I know I’m pregnant?
From the moment of conception, the hormone human chorionic gonadotrophin (hCG) will be present in your blood. This hormone is created by the cells that form the placenta (food source for the growing fetus).
It’s also the hormone detected in a pregnancy test. Even though this hormone is there from the beginning, it takes time for it to build within your body. It typically takes three to four weeks from the first day of your last period for the hCG to increase enough to be detected by pregnancy tests.
When should I reach out to my healthcare provider about a new pregnancy?
Most healthcare providers will have you wait to come in for an appointment until you have had a positive home pregnancy test. These tests are very accurate once you have enough hCG circulating throughout your body. This can be a few weeks after conception. It’s best to call your healthcare provider once you have a positive pregnancy test to schedule your first appointment.
When you call, your healthcare provider may ask you if you are taking a prenatal vitamin. These supplements contain folic acid. It’s important that you get at least 400mcg of folic acid each day during a pregnancy to make sure the fetus's neural tube (beginning of the brain and spine) develops correctly.
Many healthcare providers suggest that you take prenatal vitamins with folic acid even when you aren’t pregnant. If you weren’t taking prenatal vitamins before your pregnancy, your provider may ask you to start as early as possible.
What’s the timeline for fetal development?
The fetus will change a lot throughout a typical pregnancy. This time is divided into three stages, called trimesters. Each trimester is a set of about three months. Your healthcare provider will probably talk to you about fetal development in terms of weeks. So, if you are three months pregnancy, you are about 12 weeks.
You will see distinct changes in the fetus, and yourself, during each trimester.
Traditionally, we think of a pregnancy as a nine-month process. However, this isn’t always the case. A full-term pregnancy is 40 weeks, or 280 days. Depending on what months you are pregnant during (some are shorter and some longer) and what week you deliver, you could be pregnant for either nine months or 10 months.
This is completely normal and healthy.
Once you get close to the end of your pregnancy, there are several category names you might hear regarding when you go into labor. These labels divide up the last few weeks of pregnancy. They’re also used to look out for certain complications in newborns. Babies that are born in the early term period or before may have a higher risk of breathing, hearing or learning issues than babies born a few weeks later in the full term time frame. When you’re looking at these labels, it’s important to know how they’re written. You may see the week first (38) and then you’ll see two numbers separated by a slash mark (6/7). This stands for how many days you currently are in the gestational week. So, if you see 38 6/7, it means that you are on day 6 of your 38th week.
The last few weeks of pregnancy are divided into the following groups:
- Early term: 37 0/7 weeks through 38 6/7 weeks.
- Full term: 39 0/7 weeks through 40 6/7 weeks.
- Late term: 41 0/7 weeks through 41 6/7 weeks.
- Post term: 42 0/7 weeks and on.
Talk to your healthcare provider about any questions you may have about gestational age and due date.
Stages of Growth Month-by-Month in Pregnancy
First trimester
The first trimester will span from conception to 12 weeks. This is generally the first three months of pregnancy. During this trimester, the fertilized egg will change from a small grouping of cells to a fetus that is starting to have a baby’s features.
Month 1 (weeks 1 through 4)
As the fertilized egg grows, a water-tight sac forms around it, gradually filling with fluid. This is called the amniotic sac, and it helps cushion the growing embryo.
During this time, the placenta also develops. The placenta is a round, flat organ that transfers nutrients from the mother to the fetus, and transfers wastes from the fetus. Think of the placenta as a food source for the fetus throughout your pregnancy.
In these first few weeks, a primitive face will take form with large dark circles for eyes. The mouth, lower jaw and throat are developing. Blood cells are taking shape, and circulation will begin. The tiny "heart" tube will beat 65 times a minute by the end of the fourth week.
By the end of the first month, the fetus is about 1/4 inch long – smaller than a grain of rice.
Month 2 (weeks 5 through 8)
Facial features continue to develop. Each ear begins as a little fold of skin at the side of the head. Tiny buds that eventually grow into arms and legs are forming. Fingers, toes and eyes are also forming.
The neural tube (brain, spinal cord and other neural tissue of the central nervous system) is well formed now. The digestive tract and sensory organs begin to develop too. Bone starts to replace cartilage.
The head is large in proportion to the rest of the body at this point. At about 6 weeks, a heartbeat can usually be detected.
After the 8th week, healthcare providers refer to it as a fetus instead of an embryo.
By the end of the second month, the fetus is about 1 inch long and weighs about 1/30 of an ounce.
Month 3 (weeks 9 through 12)
The arms, hands, fingers, feet and toes are fully formed. At this stage, the fetus is starting to explore a bit by doing things like opening and closing its fists and mouth. Fingernails and toenails are beginning to develop and the external ears are formed. The beginnings of teeth are forming under the gums. The reproductive organs also develop, but sex is still difficult to distinguish on ultrasound.
By the end of the third month, the fetus is fully formed. All the organs and limbs (extremities) are present and will continue to develop in order to become functional. The circulatory and urinary systems are also working and the liver produces bile.
At the end of the third month, the fetus is about 4 inches long and weighs about 1 ounce.
Since the most critical development has taken place, your chance of miscarriage drops considerably after three months.
Second trimester
This middle section of pregnancy is often thought of as the best part of the experience. By this time, any morning sickness is probably gone and the discomfort of early pregnancy has faded. The fetus will start to develop facial features during this month. You may also start to feel movement as the fetus flips and turns in the uterus. During this trimester, many people find out whether their baby will be designated male or female at birth. This is typically done during an anatomy scan (an ultrasound that checks physical development) around 20 weeks.
Month 4 (weeks 13 through 16)
The fetal heartbeat may now be audible through an instrument called a doppler. The fingers and toes are well-defined. Eyelids, eyebrows, eyelashes, nails and hair are formed. Teeth and bones become denser. The fetus can even suck his or her thumb, yawn, stretch and make faces.
The nervous system is starting to function. The reproductive organs and genitalia are now fully developed, and your doctor can see on ultrasound if the fetus will be designated male or female at birth.
By the end of the fourth month, the fetus is about 6 inches long and weighs about 4 ounces.
Month 5 (weeks 17 through 20)
At this stage, you may begin to feel the fetus moving around. The fetus is developing muscles and exercising them. This first movement is called quickening and can feel like a flutter.
Hair begins to grow on the head. The shoulders, back and temples are covered by a soft fine hair called lanugo. This hair protects the fetus and is usually shed at the end of your baby's first week of life.
The skin is covered with a whitish coating called vernix caseosa. This "cheesy" substance is thought to protect fetal skin from the long exposure to the amniotic fluid. This coating is shed just before birth.
By the end of the fifth month, the fetus is about 10 inches long and weighs from 1/2 to 1 pound.
Month 6 (weeks 21 through 24)
If you could look inside the uterus right now, you would see that the fetus's skin is reddish in color, wrinkled and veins are visible through translucent skin.
The finger and toe prints are visible. In this stage, the eyelids begin to part and the eyes open.
The fetus responds to sounds by moving or increasing the pulse. You may notice jerking motions if the fetus hiccups.
If born prematurely, your baby may survive after the 23rd week with intensive care.
By the end of the sixth month, the fetus is about 12 inches long and weighs about 2 pounds.
Month 7 (weeks 25 through 28)
The fetus continues to mature and develop reserves of body fat. At this point, hearing is fully developed. The fetus changes position frequently and responds to stimuli, including sound, pain and light. The amniotic fluid begins to diminish.
If born prematurely, your baby would be likely to survive after the seventh month.
At the end of the seventh month, the fetus is about 14 inches long and weighs from 2 to 4 pounds.
Third trimester
This is the final part of your pregnancy. You may be tempted to start the countdown till your due date and hope that it would come early, but each week of this final stage of development helps the fetus prepare for birth.
Throughout the third trimester, the fetus gains weight quickly, adding body fat that will help after birth.
Remember, even though popular culture only mentions nine months of pregnancy, you may actually be pregnant for 10 months. The typical, full-term pregnancy is 40 weeks, which can take you into a tenth month. It’s also possible that you can go past your due date by a week or two (41 or 42 weeks). Your healthcare provider will monitor you closely as you approach your due date. If you pass your due date, and don’t go into spontaneous labor, your provider may induce you. This means that medications will be used to make you go into labor and have the baby. Make sure to talk to your healthcare provider during this trimester about your birth plan.
Month 8 (weeks 29 through 32)
The fetus continues to mature and develop reserves of body fat. You may notice more kicking. The brain developing rapidly at this time, and the fetus can see and hear. Most internal systems are well developed, but the lungs may still be immature.
The fetus is about 18 inches long and weighs as much as 5 pounds.
Month 9 (weeks 33 through 36)
During this stage, the fetus continues to grow and mature. The lungs are close to being fully developed at this point.
The fetus has coordinated reflexes and can blink, close the eyes, turn the head, grasp firmly, and respond to sounds, light and touch.
The fetus is about 17 to 19 inches long and weighs from 5 ½ pounds to 6 ½ pounds.
Month 10 (Weeks 37 through 40)
In this final month, you could go into labor at any time. You may notice that less movement because space is tight. At this point, The fetus's position may have changed to prepare for birth. Ideally, it's head down in your uterus. You may feel very uncomfortable in this final stretch of time as the fetus drops down into your pelvis and prepares for birth.
Your baby is ready to meet the world at this point. They are about 18 to 20 inches long and weigh about 7 pounds.
Fetal development Information | Mount Sinai
Zygote; Blastocyst; Embryo; Fetus
Learn how your baby is conceived and how your baby develops inside the mother's womb.
At 3.5 weeks, the fetus will have formed the heart, begins development of the brain and spinal cord, and starts forming the gastrointestinal tract.
At 7.5 weeks, the eyes move forward on the face and eyelids begin to form, the palate is nearing completion and the tongue begins to form, the gastrointestinal tract separates from the genitourinary tract, and all essential organs have begun to form.
At 8.5 weeks, the embryo now resembles a human. Facial features continue to develop, the beginnings of external genitalia form, the anal passage opens although the rectal membrane is intact, circulation through the umbilical cord is well developed, and long bones begin to form.
A fetus at 10 weeks of development has fully formed eyelids and well-formed digits and ears.
A fetus at 12 weeks can make a fist and suck its thumb.
At week 16, the fetus reaches a length of about 6 inches, makes active movements, and makes sucking motions with the mouth.
At 24 weeks, the fetus has fully developed eyes, has a hand and startle reflex, is forming footprints and fingerprints, and is forming alveoli in the lungs.
At 26 to 30 weeks, a fetus is rapidly developing its brain controls and some body functions.
The fetus has eyelids which open and close and has a rapidly developing respiratory system.
At 30 to 32 weeks, a fetus has increased central nervous system control over body functions and rhythmic breathing movements. It is still developing lungs and is partially in control of body temperature.
Information
WEEK BY WEEK CHANGES
Gestation is the period of time between conception and birth when a baby grows and develops inside the mother's womb. Because it's impossible to know exactly when conception occurs, gestational age is measured from the first day of the mother's last menstrual cycle to the current date. It is measured in weeks.
This means that during weeks 1 and 2 of pregnancy, a woman is not yet pregnant. This is when your body is preparing for a baby. A normal gestation lasts anywhere from 37 to 42 weeks.
Week 1 to 2
- The first week of pregnancy starts with the first day of a woman's menstrual period.
She is not yet pregnant. - During the end of the second week, an egg is released from an ovary. This is when you are most likely to conceive if you have unprotected intercourse.
Week 3
- During intercourse, sperm enters the vagina after the man ejaculates. The strongest sperm will travel through the cervix (the opening of the womb, or uterus), and into the fallopian tubes.
- A single sperm and the mother's egg cell meet in the fallopian tube. When the single sperm enters the egg, conception occurs. The combined sperm and egg is called a zygote.
- The zygote contains all of the genetic information (DNA) needed to become a baby. Half the DNA comes from the mother's egg and half from the father's sperm.
- The zygote spends the next few days traveling down the fallopian tube. During this time, it divides to form a ball of cells called a blastocyst.
- A blastocyst is made up of an inner group of cells with an outer shell.
- The inner group of cells will become the embryo.
The embryo is what will develop into your baby. - The outer group of cells will become structures, called membranes, which nourish and protect the embryo.
Week 4
- Once the blastocyst reaches the uterus, it buries itself in the uterine wall.
- At this point in the mother's menstrual cycle, the lining of the uterus is thick with blood and ready to support a baby.
- The blastocyst sticks tightly to the wall of the uterus and receives nourishment from the mother's blood.
Week 5
- Week 5 is the start of the "embryonic period." This is when all the baby's major systems and structures develop.
- The embryo's cells multiply and start to take on specific functions. This is called differentiation.
- Blood cells, kidney cells, and nerve cells all develop.
- The embryo grows rapidly, and the baby's external features begin to form.
- Your baby's brain, spinal cord, and heart begin to develop.
- Baby's gastrointestinal tract starts to form.
- It is during this time in the first trimester that the baby is most at risk for damage from things that may cause birth defects. This includes certain medicines, illegal drug use, heavy alcohol use, infections such as rubella, and other factors.
Weeks 6 to 7
- Arm and leg buds start to grow.
- Your baby's brain forms into 5 different areas. Some cranial nerves are visible.
- Eyes and ears begin to form.
- Tissue grows that will become your baby's spine and other bones.
- Baby's heart continues to grow and now beats at a regular rhythm. This can be seen by vaginal ultrasound.
- Blood pumps through the main vessels.
Week 8
- Baby's arms and legs have grown longer.
- Hands and feet begin to form and look like little paddles.
- Your baby's brain continues to grow.
- The lungs start to form.
Week 9
- Nipples and hair follicles form.
- Arms grow and elbows develop.
- Baby's toes can be seen.
- All baby's essential organs have begun to grow.
Week 10
- Your baby's eyelids are more developed and begin to close.
- The outer ears begin to take shape.
- Baby's facial features become more distinct.
- The intestines rotate.
- At the end of the 10th week of pregnancy, your baby is no longer an embryo. It is now a fetus, the stage of development up until birth.
Weeks 11 to 14
- Your baby's eyelids close and will not reopen until about the 28th week.
- Baby's face is well-formed.
- Limbs are long and thin.
- Nails appear on the fingers and toes.
- Genitals appear.
- Baby's liver is making red blood cells.
- The head is very large -- about half of baby's size.
- Your little one can now make a fist.
- Tooth buds appear for the baby teeth.
Weeks 15 to 18
- At this stage, baby's skin is almost transparent.
- Fine hair called lanugo develops on baby's head.
- Muscle tissue and bones keep developing, and bones become harder.
- Baby begins to move and stretch.
- The liver and pancreas produce secretions.
- Your little one now makes sucking motions.
Weeks 19 to 21
- Your baby can hear.
- The baby is more active and continues to move and float around.
- The mother may feel a fluttering in the lower abdomen. This is called quickening, when mom can feel baby's first movements.
- By the end of this time, baby can swallow.
Week 22
- Lanugo hair covers baby's entire body.
- Meconium, baby's first bowel movement, is made in the intestinal tract.
- Eyebrows and lashes appear.
- The baby is more active with increased muscle development.
- The mother can feel the baby moving.
- Baby's heartbeat can be heard with a stethoscope.
- Nails grow to the end of baby's fingers.
Weeks 23 to 25
- Bone marrow begins to make blood cells.
- The lower airways of the baby's lungs develop.
- Your baby begins to store fat.
Week 26
- Eyebrows and eyelashes are well-formed.
- All parts of baby's eyes are developed.
- Your baby may startle in response to loud noises.
- Footprints and fingerprints are forming.
- Air sacs form in baby's lungs, but lungs are still not ready to work outside the womb.
Weeks 27 to 30
- Baby's brain grows rapidly.
- The nervous system is developed enough to control some body functions.
- Your baby's eyelids can open and close.
- The respiratory system, while immature, produces surfactant. This substance helps the air sacs fill with air.
Weeks 31 to 34
- Your baby grows quickly and gains a lot of fat.
- Rhythmic breathing occurs, but baby's lungs are not fully mature.
- Baby's bones are fully developed, but are still soft.
- Your baby's body begins storing iron, calcium, and phosphorus.
Weeks 35 to 37
- Baby weighs about 5 1/2 pounds (2.5 kilograms).
- Your baby keeps gaining weight, but will probably not get much longer.
- The skin is not as wrinkled as fat forms under the skin.
- Baby has definite sleeping patterns.
- Your little one's heart and blood vessels are complete.
- Muscles and bones are fully developed.
Week 38 to 40
- Lanugo is gone except for on the upper arms and shoulders.
- Fingernails may extend beyond fingertips.
- Small breast buds are present on both sexes.
- Head hair is now coarse and thicker.
- In your 40th week of pregnancy, it has been 38 weeks since conception, and your baby could be born any day now.
Feigelman S, Finkelstein LH. Assessment of fetal growth and development.
In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. Nelson Textbook of Pediatrics. 21st ed. Philadelphia, PA: Elsevier; 2020:chap 20.
Ross MG, Desai M, Ervin MG. Fetal development, physiology, and effects on long-term health. In: Landon MB, Galan HL, Jauniaux ERM, et al, eds. Gabbe's Obstetrics: Normal and Problem Pregnancies. 8th ed. Philadelphia, PA: Elsevier; 2021:chap 2.
Last reviewed on: 7/13/2021
Reviewed by: John D. Jacobson, MD, Department of Obstetrics and Gynecology, Loma Linda University School of Medicine, Loma Linda, CA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
Fetal Development by Week of Pregnancy
Having passed the critical period of the first 12 weeks, you can enjoy your pregnancy. The second trimester is considered the easiest of all during gestation.
A second fetal ultrasound is recommended at 20-21 weeks to check for abnormalities or confirm a normal pregnancy.
Child development at 20 weeks of gestation
At 20 weeks of gestation, the lungs are formed. Also one of the innovations is the response of the embryo to light. Photoreceptors are formed on the retina. This causes its reaction to external light stimuli. nine0003
The blink reflex begins to form, due to which the facial expressions of the crumbs become more and more like a person. On a fetal ultrasound, you can see how the baby winks, smiles or frowns, closes his eyes and opens his eyes wide.
Now there is an active growth of the epithelium. Subcutaneous adipose tissue is still insufficient. Therefore, normal heat exchange processes are not yet possible. But the intestines actively process all substances. Meconium is already appearing - the original feces that the baby releases into the amniotic fluid. nine0003
Child development at 21 weeks of pregnancy
The baby is growing and getting stronger every day. Now his height is almost 26 cm, weight 416 g! 21 weeks! pregnancy is significant in the formation of the vestibular apparatus.
Now, more than ever, mommy should take care of good nutrition with plenty of protein. The endocrine system continues to develop. The endocrine glands actively produce hormones for the normal growth of the child.
Now the baby's body consists entirely of lubrication. Lubrication is the secret of residual fragments of skin and fluff, sebaceous glands. Its main function is to prevent amniotic water from getting on the baby's skin. nine0003
3rd trimester: what is the need for an ultrasound examination
Today, doctors do not insist on an ultrasound examination of a child in the last trimester. However, it is recommended to carry out in order to ascertain the norms of development and growth. The optimal terms are 32-33 weeks. Also, the attending physician prescribes a study without fail for pregnant women with a severe history and a difficult pregnancy.
How the baby develops at 32 weeks of gestation
At 32 weeks the heart is fully formed and functions well.
Heart rate can be measured on a fetal ultrasound. On average, the parameters differ from an adult by 2 times. So far, the batal duct remains open - the connecting opening between the atria. It will remain in this form until the very birth of the crumbs and will close only after its birth.
The immune system is in an active phase. B-lymphocytes begin to be produced, which are necessary to protect the body from infections, both viral and bacterial. nine0003
How a baby develops at 33 weeks of pregnancy
Now the baby weighs 2088 kg. Its height is 43.6 cm. It occupies all the space inside the fetal egg, it is rather problematic to carry out movement. The cardiovascular system is active, the mass of the heart becomes larger due to increased blood circulation.
At 33 weeks, the functionality of the kidneys expands. Now they filter all the substances that are released into the amniotic fluid. The nerve centers of the brain are actively formed, which are responsible for:
- respiratory system
- vascular system
- thermoregulation, etc.
Fetal ultrasound can be done in our medical center at any stage of pregnancy. Call us now and make a preliminary appointment for the study.
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Fertility clinic patient pregnancy calendar
Hello! The problem of infertility was not someone else's for me. We tried to get pregnant for five years, and our hopes collapsed one after another. As a result, we used the services of the infertility treatment clinic, and we ended up with an IVF protocol. My daughter, the happy result of this protocol, will soon be one and a half years old. All this time - from the first visit to the doctor and before childbirth, I kept a diary, I keep it now - I write down important moments of our life.
nine0077
I hope my daughter will have a brother or sister - already with the help of the cryo-protocol. I know how hard it is to believe that everything will be fine when your life turns into one continuous examination, various procedures and fruitless attempts. However, believe me - EVERYTHING WILL BE OK .
I would be glad if you find support and useful information in my diary
| | Today I found out that I'm pregnant... I'm writing, but I can't believe it myself! It's amazing how much I didn't know about pregnancy! It turns out that on the 1st and 2nd week of the pregnancy calendar, the woman is not actually pregnant yet. At this stage, the central nervous system actively rebuilds the hormonal background in order to gradually prepare one of the three hundred thousand eggs for fertilization. |
| 3rd week | This is the optimal period for conception. The sperm is resorbed in the egg and its nucleus is reunited with the chromosome of the egg. A few days after fertilization, a blastocyst is attached to the upper part of the internal cavity of the uterus, from the side of the ovary. It is a hollow, fluid-filled germinal vesicle, a cluster of cells. My doctor said that after artificial insemination my baby develops in the same way as with conventional conception. The same processes are taking place in my body... now I feel like an ordinary woman, and I am extremely happy! nine0077 |
| 4 weeks | I developed unexplained irritability, fatigue, swollen mammary glands. |
| Week 5 | Now my baby looks more like a cute cylinder 1.5 - 2.5 mm long. The laying of his heart begins (along with the laying of the upper respiratory tract - the larynx and trachea). Gradually, blood vessels begin to form. The rudiments of the liver and pancreas appear. The embryo is curved in the shape of the letter "C". In my body, hormonal changes continue, which leads to early toxicosis. nine0077 |
| Week 6 | At this stage, the neural tube of the embryo has already been covered with tissue. |
| 7 week | Already on the seventh week the brain develops intensively, the digestive tract begins to form, the rectum is present. Surprisingly, the rudiments of the face, eyes (iris), mouth, nose appear. You can even make out the tiny nostrils. Now my baby has grown to about 8 mm - he is like a pea. The length from the crown to the sacrum is approximately 5-13 mm. Weight - about 0.8 g. The areolas of my mammary glands have darkened ... This is a common occurrence in my position. nine0077 |
| 8 week | Now, at eight weeks old, my baby is already making his first spontaneous movements. |
| 9 week | The ninth week has gone: the “back” of the embryo will begin to straighten, and the tail will “dry out”. There is an intensive development of the brain. This week begins the formation of the cerebellum (the part of the brain that provides coordination of movements). The length from the crown to the sacrum is approximately 22-30 mm. Weight - about 4 g. I still have increased fatigue, nausea, and sometimes dizziness. |
| 10 week | The final week of the embryo stage has arrived - the tenth! The general parameters of the body have already been laid down. And by the end of the week, it can be officially called a fetus. My baby is already able to move involuntarily. The length from the crown to the sacrum is approximately 31-42 mm. It is the size of a small plum. Weight - about 5 g. I have increased excitability and mood swings. This is a consequence of the influence of high levels of hormones in the body. nine0077 |
| Week 11 | Growing up! It is from the eleventh to the twentieth week of pregnancy that my baby will develop rapidly. Inside a small organism, internal organs develop, genitals are revealed, the formation of the sternum is completed, fingers and toes continue to develop. |
| 12 week | At the twelfth week, all the systems of my baby's body have already formed, they only have to grow and develop. The length from the crown to the sacrum is approximately 61 mm. Now it is the size of a large chicken egg. Weight - about 9-13 g. My uterus has increased in width by about 10 cm. It becomes tight in the hip area, and it rises into the abdominal cavity. The state of health is slowly improving: nausea begins to pass, the stomach grows, but it is not too large yet - ordinary clothes are still in time. |
| Week 13 | The most important event of this week of my baby's development is the beginning of his rapid growth, which will end by the 22nd week of fetal development. By this period, the fetus has formed all twenty milk teeth. The tissue begins to be laid, from which the bones of the child will be formed, a pair of ribs is outlined, the nose and chin emerge more clearly. The length from the crown to the sacrum is 65-78 mm. The baby is the size of a peach. Weight - about 14-20 g. The uterus greatly increased, filled the hip area and began to grow upwards. I'm already feeling it in my lower abdomen. My weight has increased and I've started to look for loose-fitting clothes. nine0077 |
| Week 14 | At the fourteenth week, my baby's face continues to take shape: the bridge of the nose, cheeks and ears are drawn. |
| Week 15 | nine0002 My baby's rapid growth continues. The skin is still very thin, and the color is closer to red than to pink. A few fine hairs mark the eyebrows, hair on the head and on the body breaks through. The arms bend at the elbows and wrists, clenched into tiny fists. The length from the crown to the sacrum is 93-103 mm. Baby the size of a mango. Weight - about 50 g. The turning point has come! I feel great! Nausea is completely gone, but the stomach still does not interfere. You can feel the uterus - it is located 7-10 cm below the navel. And in a week or two, I can already feel the movements of my baby. nine0077 |
| Week 16 | In our family, another reason to celebrate - we have sixteen weeks! Another important period has passed. My baby is now holding his head straight. The muscles of his face are formed, so he begins to grimace, winks involuntarily, opens and closes his mouth, frowns. Improves hand-leg coordination. The length from the crown to the sacrum is 108-116 mm. The baby is the size of an orange. Weight - about 80 g. At this stage, my uterus continues to expand, giving space to the fetus growing in the placenta. nine0077 |
| Week 17 | Yes. |
| Week 18 | My baby is growing and I am getting bigger. The strengthening of the bones of the fetus continues, the facial features are becoming clearer every day, the phalanges of the fingers and toes are formed, and a pattern has already appeared on them, which ensures the uniqueness of the fingerprints. |
| Week 19 | Soon the middle of pregnancy... And now the development and growth of the brain continues, the limbs already have proportional sizes, the growth of the child slows down a little, the formation of fat begins, the most important source of heat for the newborn - at the base of the neck, behind the chest, around the kidneys. The child already distinguishes light from darkness. The length from the crown to the sacrum is 13-15 cm. The baby is the size of a small zucchini. |
| Week 20 | At 20 weeks my baby is a tiny human with hair on his head and tiny nails on his fingers and toes. He yawns, sucks his thumb, plays with the umbilical cord, somersaults. This week his skin thickens, becomes four layers. The length from the crown to the sacrum is 14-16 cm. The baby is the size of a small melon. Weight - about 260 g. Half of the pregnancy is over ... |
| 21 weeks | At the twenty-first week, my baby's blood count is already quite high in red blood cells. White blood cells are now beginning to be produced, which are responsible for suppressing infections. Taste buds begin to form on the tongue. |
| Week 22 | I can call this period comfortable. Now my baby continues to grow and prepare itself for life outside the womb. This week, his eyebrows are better defined, the hair on his head continues to grow. Perception is improving every day. The length from the crown to the sacrum is about 19 cm. The baby is the size of a corncob. Weight - about 350 g. My health will continue to be good. The stomach has increased, but not enough to greatly interfere. I can easily bend down, sit down, as I feel comfortable, I can easily walk. nine0077 |
| Week 23 | My baby continues to change and becomes more and more like a newborn. |
| Week 24 | My little one has already gained almost 735 g and is 31.2 cm tall. He is now very much like a newborn, although still very small. His nervous system is developing rapidly. The volume of the brain gradually increases. This week is the beginning of the child's viability, that is, his ability to live independently. At this stage, the fetus occupies the entire uterus, so it becomes cramped. Now the child is more and more listening to the outside world. The weight gain is starting to take a toll on my health. There were headaches, problems with the bladder, heaviness in the legs and general fatigue. |
| Week 25 | My baby is growing and developing. It already weighs 844 g, and its length is 32.5. Intensive strengthening of the bone-articular system continues, right now it will be determined whether it will be right-handed or left-handed. There is a fingerprint pattern on his fingers. And he has formed his own special mode of sleep and wakefulness. My body continues to tirelessly prepare for a meeting with the baby: the breast becomes more elastic, and the mammary glands began to secrete colostrum, a substance similar in composition to breast milk. The uterus has grown a little more, this is especially noticeable when viewed from the side. nine0077 |
| Week 26 | At this time, my baby gradually begins to open his eyes. He even developed taste buds. Therefore, at this stage of pregnancy, he already shows a love for sweets. At 26 weeks I continue to have headaches, leg cramps, back and pelvic pain. The tremors become more and more sharp and also give pain under the ribs. It can be relieved by lying on your side. |
| Week 27 | At this stage, my baby has all the major organ systems working, although they have yet to develop. The brain has been growing rapidly in the last three months. The skin looks very wrinkled due to constant exposure to the aquatic environment. This will disappear a few weeks before delivery. The length from the crown of the head to the sacrum is about 35.5 cm. The weight is approximately 1135 g. Under the weight of the growing belly, the posture begins to change - the back gradually deviates back, a proud gait appears. |
| Week 28 | At 28 weeks my baby is already opening his eyes. The final color of the eyes will be established a few months after birth. They are framed by thin short cilia. The length from the crown to the sacrum is about 25 cm. Weight is approximately 1100 g. The uterus grows and is already high above the navel - approximately 8.5-9cm, and from the symphysis - by almost 30 cm. The weight also increased. From now on, I need to visit my doctor at least once every two weeks. |
| Week 29 | At 29 weeks my baby is busy preparing for birth and extrauterine life. He has already learned to more or less regulate his own body temperature. His immune system kicks in. |
| 30 week | At thirtieth week my baby's eyes are already wide open, he reacts to bright light shining through his stomach, he has hair growing, his whole head is covered with them, but the skin is still wrinkled. The child has developed its own rhythm of sleep and wakefulness. He is ready to show maximum agility just when I am trying to fall asleep. The length from the top of the head to the sacrum is about 27 cm. Weight is about 1400 g. The center of gravity of my body continues to move, I watch my posture. The volume of urine has increased, it is harder for the kidneys to perform their function. Physical exercise helps me properly prepare for childbirth. |
| 31 weeks | At this stage, my baby continues to grow. He has already become plump, blood vessels are no longer visible under the skin, and he has also mastered sucking, his kidneys work well. The length from the top of the head to the sacrum is about 28 cm. Weight is about 1600 g. Now my body produces a special hormone-relaxin. This substance causes weakening of the joints of the pelvic bones. The pelvic ring becomes more extensible. The more pliable it is, the less difficulties for the child during his birth. nine0077 |
| 32 weeks | My baby already weighs about 1.9 kg. Its length is 42.3 cm. Most of the wrinkles have disappeared from the face. There is a lot of hair on the head. Weight is gained incredibly quickly. His nervous system continues to develop, and when light hits his face, the pupils constrict; the surface of the brain is cut through by convolutions; the head has become more proportional to the body, and other organs are developing. |
| Week 33 | My baby continues to grow. All fingers and toes cover the grooves - a skin pattern. He still has enough room to move, and he continues to push and roll. However, the space is narrowing, and by the end of the week somersaults will end. The baby sleeps a lot. Waking up, he begins to listen to sounds and to his feelings. The length from the top of the head to the sacrum is about 43.6 cm. Weight is about 2000 g. Now the weight is growing much faster than in the early stages of pregnancy. I find it increasingly difficult to find a comfortable sleeping position, and I dream that when I give birth, I will sleep only on my stomach. nine0077 |
| 34 weeks | My chubby baby weighs almost 2248g. He is 44. |
| 35 week | Soon my baby will begin to descend. The walls of the water room begin to confuse him. This week, the baby's nails have already grown to the very edge of the fingers. Therefore, there may be scratches on the face that the baby received while in the womb. Starting this week, he will gain approximately 220 grams weekly. The development and improvement of internal organs continues. The length from the crown to the sacrum is about 45.4 cm. The weight is about 2550 g. |
| 36 week | At this stage my baby has chubby cheeks and a body to match. He is preparing for feeding and therefore sucks his fingers all the time. The skull is still quite soft. Now the baby begins to actively prepare for birth. Length from crown to sacrum - about 47 cm. Weight - about 2750 g. From this week I should see my doctor weekly. nine0077 |
| 37 week | Changes continue in my baby's nervous system. A protective sheath is created around the nerves. This process will continue during the first year of life, it allows for better coordination of movements. Now the child is fully developed and ready to be born. However, this does not mean that it stops growing and developing. |
| 38 week | My baby is gaining weight on average about 30 grams per day and continues to intensively prepare for life outside the womb. His height is about 50 cm. Weight - about 3000 g. Only 5% of multiparous mothers walk longer than this period. The first stage of my labor will be vigorous contractions, thinning and stretching the cervix, allowing the fetus to enter the birth canal. The second stage is the exit of the child through the vagina and its birth. The third stage is the separation of the children's place. nine0077 |
| 39 week | My baby weighs about 3.2 kg. His height is 50.2 cm. All organs and systems have already formed, are in the "right" places and continue to develop. The respiratory system is the last to develop. |
| 40 week | My baby is very tired from the darkness. His movements have slowed down - he is preparing for the birth. Now he weighs about 3.5 kg. With a height of 50 cm. He is about the size he will be at birth. Milk teeth are fully formed, although they will appear only 8-10 months after birth. The long-awaited moment of the meeting will come soon. My family and I are already tired of waiting. Now I am worried about only one thing - how the birth will go. I just make sure everything is going to be alright. So it will be. After all, I did everything possible to prepare for childbirth. nine0077 |
For a “normal” pregnancy, a new cycle begins within the first two weeks, ovulation occurs and the egg is fertilized. This period is included in the familiar concept of “9months of pregnancy”, since it is then that the prototype of the unborn child is formed. 
The doctor said: “So the corpus luteum in your ovary is working tirelessly!”. By the way, it is on the fourth week that a new hormone appears in a woman's body - chorionic gonadotropin, or hCG. During this period, the fertilized egg begins to turn into an embryo. It resembles a flat disk made up of layers. At this time, extra-embryonic organs are actively developing, providing nutrition, respiration, biochemical support and comprehensive protection of the baby. nine0077 
At its end, the brain begins to form, the heart begins to beat, the rudiments of arms and legs appear. The length from the crown to the sacrum is 2-4 mm. The volume of amniotic fluid is 2-3 ml. To those changes in well-being that appeared last week, new ones were added: headaches, frequent urination, drowsiness, decreased appetite, nausea and even vomiting. nine0077 
His ears, nose and upper lip begin to emerge. Hands and fingers are clearly visible. The formation of the heart is completed - the partitions between its departments are being improved. Ultrasound performed at the end of the eighth week would have made it possible to distinguish between the head and pelvic ends of the embryo. The length from the crown to the sacrum is approximately 14-20 mm. Weight - about 3 g. At the eighth week, my uterus begins to increase, but it is not noticeable yet. nine0077 
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At this stage, the liver is one tenth of the baby's weight. The kidneys begin to work, producing urine. The length from the crown to the sacrum is approximately 44-60 mm. The baby is about the size of an apricot. Weight - about 8 g. The doctor explained to me that during this period my body burns calories faster than before pregnancy. The volume of circulating blood also increases. Therefore, I feel internal heat, drink a lot of fluids and sweat profusely ... 
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The eyes are no longer so widely spaced. Lanugo appears - an embryonic fluff that performs a protective function. In a boy, a prostate appears during this period, and in girls, the ovaries descend from the abdominal cavity to the hip region. nine0098 The genitals can be characterized as male and female, but they are not yet distinguishable on ultrasound. The length from the crown to the sacrum is 80-113 mm. The baby is the size of a pear. Weight - approximately 25 g. Now is the heyday of my Pregnancy. I feel more energized even though my uterus is getting bigger every week. 
.. Pregnancy can't be hidden any more - my tummy more and more betrays our future status. Now the placenta is already fully formed, with a dense network of blood vessels through which nutrients enter and waste products are ejected. The baby learns to respond to loud noises that occur nearby. The length from the crown of the head to the sacrum is 11-12 cm. The weight is about 100 g. The doctor warned: if you suddenly experience discomfort, or even pain, you should not be afraid: the uterus grows and, as it grows, presses on the internal organs, shifting them upwards, and to the sides. nine0077 
My baby is already beginning to perceive the outside world and makes itself felt by pushing his leg into the stomach. The length from the crown to the sacrum is 12.5-14 cm. The baby is the size of a large grapefruit. Weight - about 150 g. At the eighteenth week, sleep and rest gives me some inconvenience, as my uterus continues to grow and requires more and more space in the abdominal cavity. nine0077 
Weight - about 200 g. I have already put on quite a lot of weight, my stomach is growing, and often I look for a comfortable position for a very long time to fall asleep. nine0077 
The length from the crown to the sacrum is about 18 cm. The baby is the size of a large banana. Weight - about 300 g. From now until the thirtieth week, I will intensively gain weight. The uterus has risen and already rises above the navel by about 1 cm. My weight gain was from 6-6.5 kg. nine0077 
His body is rounded, the fluff with which he is covered darkens. The child is becoming more and more active. The length from the crown to the sacrum is about 20 cm. My baby is the size of a large eggplant. Weight - about 450 g. The uterus has risen almost 4 cm above the navel, its height above the pubic symphysis is 23 cm. Weight gain is from 5 to 7 kg. nine0077 
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Now the child hears everything that happens inside and around. The length from the crown to the sacrum is about 40 cm. The baby is the size of an average watermelon. Weight - about 970 g. 
Bending the back in the spine entails not only a change in posture, but also the appearance of pain in the lower back. nine0077 
The teeth are still hidden in the gums, but enamel has already appeared on them. The length from the top of the head to the sacrum is about 26 cm. Weight is about 1250 g. To reduce discomfort, I try to monitor my posture, nutrition and, of course, rest more. nine0077 
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The uterus continues to grow, the discomfort intensifies. nine0077 
5 cm tall. This week his skin has become smoother and rosier due to the fact that white energy-dense fat already makes up 8% of his weight. From this, the hair on the child's head became much thicker. He has almost shed the germinal fluff. My body continues to prepare for childbirth. Uterine contractions begin to differ somewhat from those that used to be. Braxton Hicks contractions become more regular. nine0077 
It became easier for me to breathe as the child began to sink, and the pressure on the diaphragm decreased. nine0077 
His height is about 49see Weight - approx. 2950 
This is the last week before giving birth, and yet, the little one continues to "get fat". There isn't enough room for him, it's cramped in my tummy. He, too, is tired and is preparing to be born. Childbirth can begin at any time. nine0077 Conclusion
We wish you good tests, good doctors, easy conscious childbirth and healthy children in the near future, so that your female happiness reaches its highest point and does not give up its positions.
