Weight is one indicator of good nutrition and physical development. It can therefore be helpful to know about babies’ average weight month by month.
First, it is worth noting that average weight is not “normal” weight. Just like adults, babies come in all shapes and sizes. If a baby’s weight is in a lower percentile, this does not necessarily signal a problem with their growth or physical development. With this in mind, using a weight chart can help a person generally track their baby’s growth.
The Centers for Disease Control and Prevention (CDC) recommend using the World Health Organization (WHO) weight chart for babies up to 2 years of age.
This article describes the average weight of a baby month by month from birth. It also explores what can affect a baby’s weight.
According to the WHO, the average birth weight of a full-term male baby is 7 pounds (lb) 6 ounces (oz), or 3.3 kilograms (kg). The average birth weight of a full-term female is 7 lb 2 oz, or 3. 2 kg.
The average weight of a baby born at 37–40 weeks ranges from 5 lb 8 oz to 8 lb 13 oz. This is 2.5 to 4 kg.
At delivery, experts consider a low birth weight to be less than 5 lb 8 oz, or 2.5 kg.
It is common for babies to lose around 10% of their weight shortly after birth. This decrease is mostly due to fluid loss and usually nothing to worry about. Most babies gain back this weight within 1 week.
Weight charts can help a person tell what percentile their baby’s weight falls into. For example, if their weight is in the 60th percentile, it means that 40% of babies of the same age and sex weigh more, and 60% of these babies weigh less.
This does not necessarily mean that any baby weighs too much or too little. It can simply indicate where a baby’s weight falls on a spectrum.
The chart below shows baby weights in the 50th percentile. This is the average weight. Male babies tend to weigh a little more than female babies, so the chart is divided by sex.
Female 50th percentile weight
Male 50th percentile weight
7 lb 2 oz (3.2 kg)
7 lb 6 oz (3.3 kg)
9 lb 4 oz (4.2 kg)
9 lb 14 oz (4.5 kg)
11 lb 5 oz (5.1 kg)
12 lb 4 oz (5.6 kg)
12 lb 14 oz (5.8 kg)
14 lb 1 oz (6.4 kg)
14 lb 3 oz (6.4 kg)
15 lb 7 oz (7.0 kg)
15 lb 3 oz (6.9 kg)
16 lb 9 oz (7.5 kg)
16 lb 1 oz (7.3 kg)
17 lb 8 oz (7.9 kg)
16 lb 14 oz (7.6 kg)
18 lb 5 oz (8.3 kg)
17 lb 8 oz (7.9 kg)
18 lb 15 oz (8.6 kg)
18 lb 2 oz (8.2 kg)
19 lb 10 oz (8.9 kg)
18 lb 11 oz (8.5 kg)
20 lb 3 oz (9. 2 kg)
19 lb 4 oz (8.7 kg)
20 lb 12 oz (9.4 kg)
19 lb 12 oz (8.9 kg)
21 lb 4 oz (9.6 kg)
Babies grow and gain weight the fastest within the first 6 months of life. Although this can vary, babies tend to gain around 4–7 oz, or 113–200 grams (g), per week in the first 4–6 months.
Weight gain then slows slightly, with an average gain of around 3–5 oz (about 85–140 g) per week when the baby is 6–18 months. On average, babies triple their birth weight by their first birthday.
Growth patterns do not follow a clear schedule, however.
Some babies gain weight steadily and stay in the same percentile, or close to it, for several months. Others gain weight rapidly, signalling a growth spurt, which can happen at any time. This may move a baby into a new weight percentile.
It is important not to focus on weight as the only indicator of physical development. Other measurements of this development include the baby’s length and head circumference.
Considering all three measurements gives doctors an idea about how the baby is growing, compared with other babies of the same age and sex.
Meanwhile, it is also important to keep other developmental milestones in mind. Various checklists of milestones by age are available, including one from Pathways.org, which is endorsed by organizations such as the American Academy of Pediatrics and the National Association of Pediatric Nurse Practitioners.
For anyone looking for more information about what influences the weight of a baby, several factors can be involved, including:
Male newborns tend to be bigger than female newborns, and they typically gain weight a little faster during infancy.
Weight gain and growth rates can also depend on whether the baby consumes breast milk or formula.
The American Academy of Pediatrics notes that breastfed babies gain weight and grow faster than formula-fed babies during the first 6 months.
However, that rate can shift during the next 6 months. Breastfed babies may gain weight and grow more slowly than formula-fed babies when they are aged 6 months to 1 year.
Underlying health issues can cause a baby to gain weight more slowly. For example, babies with congenital heart irregularities may gain weight at a slower rate than babies without this condition.
Health issues that affect nutrient absorption or digestion, such as celiac disease, may also lead to slow weight gain.
Babies born prematurely may grow and gain weight more slowly during their first year than babies born at full term.
However, many babies born prematurely gain weight rapidly and “catch up” by about their first birthday.
The average birth weight for full-term male babies is 7 lb 6 oz, or 3.3 kg. For female babies born full-term, the average birth weight is 7 lb 2 oz, or 3.2 kg.
Baby weight charts can help a healthcare team track a baby’s physical development by comparing the baby’s weight with the weights of others of the same age and sex.
Still, a doctor usually looks for steady growth, rather than a target percentile, when assessing a baby’s physical development. And even if a baby’s weight is in a lower percentile, they will not necessarily be a small adult — just as longer babies do not necessarily become tall adults.
Knowing about average weights by month can help people gauge their babies’ physical development, but doctors also look for other important indicators, such as length and head circumference.
Healthcare professionals also take into account whether a baby is generally hitting other milestones on time. And by taking a detailed medical history, they can rule out any medical conditions or nutritional considerations that may be preventing a baby from gaining weight appropriately.
Baby weight and height tracker growth chart
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Date of birth
Date of measurement
lb. kg. oz.
By Rebekah Wahlberg
June 21, 2022
Our growth percentile calculator shows how your baby's size compares with other boys or girls the same age. Just enter your child's weight, height (aka length), and head circumference, and we'll calculate a percentile for each. The number reflects what percentage of kids is larger or smaller than your baby. So if your 3-month-old baby is in the 40th percentile for weight, that means 40 percent of 3-month-old babies weigh less than your baby, and 60 percent weigh more.
Using our baby growth chart
When your baby is first born, you'll have several visits at your pediatrician's office to make sure your baby's growth is on track. Your pediatrician will plot your baby's weight, height, and head circumference on a growth chart.
Don't be concerned if your baby doesn't fall right in the middle of the growth chart, though. There's a wide range of normal, and your baby's measurements now don't necessarily reflect what size they'll be as an adult. It's normal for some children to be in the 10th percentile for weight, while other children are in the 90th percentile. The most important thing is that your baby is growing at a healthy and consistent rate, no matter what percentile they're in.
Our growth percentile calculator is a general educational tool only. It's not the last word on how your child is growing, and it's not a substitute for having a healthcare provider monitor your child's growth at regularly scheduled exams. At these visits, your provider will determine whether your child is following a healthy growth pattern over time.
This tool is for children under age 2 and is based on World Health Organization data for kids in that age group. And if you'd like, you can find out how tall your older child is likely to be with our Child Height Predictor.
Read on to learn more about the measurements healthcare professionals take, and learn how to measure your baby at home.
If you want to see how your baby is growing between doctor visits, here's how to get a fairly accurate weight at home:
Undress your baby completely (remove their diaper, too) and step on a scale while you're holding them. Record that weight.
Then, set your baby down and weigh yourself. Subtract your own weight from your combined weight with your baby and record that number.
This isn't as accurate as weighing your baby at the doctor's office, but it's a good estimate of how much your baby weighs.
If you're worried about your baby's weight gain, call your baby's pediatrician. They may have you come in for a visit, since it's important to have your baby weighed on a consistent scale that can accurately measure weight in pounds and ounces.
Before your baby can stand and walk on their own, their height is often recorded as their "length" – that is, how long they are from the crown of their head to the bottom of their heel while lying down. If you want to measure your baby's length at home between doctor visits, here's how:
Lay your baby down on a flat surface and stretch a measuring tape from the top of their head to the bottom of their heel. Since babies' knees naturally bend a bit, you may need a second person to stretch out their legs while you take the measurement.
Record their length to the nearest tenth of a centimeter or inch. (In the hospital, birth length is often recorded in centimeters, but your pediatrician's office will likely record their length in inches. What you do is up to you!) Your record might be a little different than the doctor's, but that's okay.
Baby head circumference
Your baby's healthcare provider will measure their head circumference for the first two years of their life to make sure your baby's brain is growing at a healthy rate.
You can measure your baby's head circumference at home, but it can be hard to do this accurately. Here's how to get a good estimate:
Wrap a flexible measuring tape around the widest part of your baby's head, just above the eyebrows and ears and around the back where their head slopes out from their neck.
Take the measurement three times (your baby may be wiggly, which could make getting an accurate measurement tough) and use the largest measurement to the nearest 0.1 centimeter.
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Il children's ideal weight is not an indication of an absolute value: in order to calculate the ideal weight, in fact, several factors must always be taken into account, such as age and relation to height . The growth of a child in the first years of life is very important and is closely related physical activity and healthy eating .
In order for your child to grow healthy , it is useful to know what your ideal weight should be in order to learn how to calculate body mass index and be able to read growth percentile charts . Obviously, to follow the ideal weight of children - since there are no absolute laws - it is always good to be able to consult your trusted pediatrician.
So, let's try to figure it out together how to calculate the ideal weight of children, what it should be according to the tables of the World Health Organization and how to calculate percentiles of height.
How is the ideal weight of children calculated?
To reiterate: the ideal weight of children is not a unique and absolute value of , but only a general indication. What is commonly referred to as ideal weight or ideal weight for children is more of a range of values that indicate what a normal weight should be at a given age. Then don't panic if your child is does not exactly match at the specified weight!
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I several parameters to consider height and, starting from the second year of life, body mass index (also called BMI ) are used to calculate the ideal weight of children. To calculate the body mass index, simply divide the child's weight (in kilograms) by the height (in square meters).
Based on these data it is possible to calculate growth percentile , that is, a reference scale for parameters considered "normal", which is based on growth curves obtained from observation of the population. from birth to 20 years old . Reading percentile tables does not happen immediately: in the following paragraphs we will explain how to do this.
Ideal weight for babies at birth and in the first months of life
The baby should be at a healthy weight at birth of about 3200-3400 grams but can be considered normal weight if it weighs from 2500 to 4500 grams. If the child weighs less than 2500 grams, this must be taken into account. underweight if more than 4500 grams overweight .
Paradoxical as it may seem, in the first days of life, the weight of a child tends to decrease by 5-7% , but - if well fed - return the lost weight before the age of 15 days . From now until the sixth month, it will increase by about 150 grams per week . Accordingly, by the fifth month of age, her weight should be twice as much compared to the birth of .
Ideal weight for children under 10 years of age
From from the first year of life to , the ideal weight of a child is approximately triple the birth weight of . Starting from 18 months Instead, weight gain starts to slow down, with a very normal physiological stop which should not scare parents.
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Between two years (when the weight is equal to four times compared to the birth of ) and 5 years, the weight of the child increases slightly less than 2 kg per year , and starting from 5 years, the growth rate begins to gradually increase, by approximately 2.4 kg per year until puberty.
Height and weight they do not always grow evenly, and this can lead - by about 6 years - to an increase in body mass index (which, as we said, depends on the ratio of weight and height).
Ideal weight tables for girls and boys
In the tables below we report for informational purposes only , the range of ideal weights for boys and girls according to age and relative height indicators. As already mentioned, they are not absolute values, and it is always good to assess the health status and regular growth rate of your child. talk to your pediatrician who will take into account the specific case.
Height percentiles expressed as weight for height.
To calculate the ideal weight of children we use a percentile, which, as we have already said, is used as a reference scale to establish weight parameters are considered normal , you can download tables with growth percentiles compiled by from this address World Health Organization and consult with them.
Se your child's body mass index is less than the fifth percentile on the value scale, so it is considered a normal weight. If the BMI value is between the 85th and 95th percentile of , then the child will be overweight, and if it is above the 95th percentile of , it will be obese.
to to simplify the consultation of height percentiles, although with a lesser degree of accuracy of the results, the value of the 50th percentile of for artificial age (age + height). However, even in these calculations, 9 is always better.0010 Seek help from your pediatrician.
For more scientific information about the ideal weight of children, you can consult the website of the World Health Organization.
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Height and weight gain for children of the first year of life. Tables
Dear parents, your baby is growing and you are worried about whether he is gaining enough weight and height. For control, there are centile tables for assessing the physical development of children, weight and height indicators. At the same time, you must remember that each baby is individual, he cannot grow according to the textbook. These weight and height recommendations are based on an average number of children and 10% deviation is normal. In addition, the centile corridor from 25% to 75% is an average physical indicator. That is why they say: Physical development is mesosomatic, macrosomatic, microsomatic.
It is important that the weight and height indicators are in the same centile corridor, but no more than two adjacent ones. Then we can talk about harmonious development. If the gap is more than two centile corridors, the development is disharmonious. Then we can think either about an unbalanced diet or about a pathology associated with obesity (paratrophy), or protein-energy deficiency (hypotrophy). In addition, one should not forget about the constitutional characteristics of the child, about genetic predisposition. Therefore, in no case should you compare your child with a neighbor's. To talk about the health of a child, we evaluate his condition according to many criteria. This is neuropsychic development, laboratory examination data, anamnesis, heredity. How many times in my practice have I met children who gained 400-450 g in weight every month, by the year they barely gained 7.8-8 kg. But at the same time, children already at 10 months began to walk, pronounce syllables, and follow complex instructions.
We'll talk about weight and height gain for term babies. In preterm infants, rates of weight gain and height differ according to the degree of prematurity. In addition, children can be born with intrauterine malnutrition.
The tables for girls and boys are different in terms of numerical indicators, but at 1 year of age, these differences are quite minimal.
Centile tables for assessing the physical development of girls from 0 to 12 months.
Body length (height), cm.
Centiles in %
Age in months
Body weight, kg.
Centiles in %
At the same time, until the age of three months, the child adds 20-30 grams per day daily, respectively, from 140 to 200 per week. If we talk about the average weight gain by months, then it is only 600 g per month, since the child after birth has physiological weight loss (with urine, feces, transition from intrauterine feeding to breastfeeding during the adaptation period), approximately 10% of the weight, which is 200-300 grams.
More often, by 3-4 days, the child restores its original weight, and then there is an increase. But I had a case in practice when the child began to gain weight from the 20th day of life, while the girl was active, reflexes were alive, her appetite was good, she could withstand the night interval, stool 4-5 times a day, urination was sufficient, developed according to age. Therefore, do not worry. Our indicator is the well-being of the child. If the baby is active, eats with appetite, sleep is calm, the skin is clean, physiological functions are not disturbed, be calm, your baby is healthy and not hungry. You see from the table the range of weight per year is from 8 to 13 kg. This is the norm. There is no reason to run to the endocrinologist, genetics, to examine the child.
Or the opposite situation: in the first months of life, a child gains 1-1.5 kg while breastfeeding. If the baby does not have colic, he does not spit up, there are no gastrointestinal manifestations, he is active, the skin is clean, physiological functions are not disturbed - this is also the norm. Remember, as often happens, premature babies quickly gain weight and catch up with their peers by the year. And large babies gain weight more slowly. In my entire thirty-year practice, only two children weighed 14-15 kg by the year, although their parents were large and tall. By the age of three, they weighed almost the same, added only in height, the rest of their peers caught up with them.
Weight gain in grams
It is believed that by 4-4.5 months the child should double the weight, and triple by the end of the year.
It happens that the increase in height and weight goes in leaps, seasonality, unevenness, and sometimes asymmetry of growth are noted. Pediatricians are concerned about the circumference of the head and chest, by 2-3 months they should be equal. Further, the breast grows faster. This is important so as not to miss the pathology.
The younger the child, the faster his growth. In the first 3 months of life, body length increases by 3 cm monthly, in the second quarter by 2.5-2 cm monthly. In the third - 1.5-2 cm, in the fourth - 1 cm monthly. The total increase in height in the first year of life is about 25 cm.
Centile tables for assessing the physical development of boys from 0 to 12 months.