How many months is my child

Baby Age Calculator | Monthly Milestones

Created by Madhu Raman

Reviewed by Wojciech Sas, PhD and Steven Wooding

Last updated: Nov 01, 2022

Table of contents:

Why are baby month counter and baby age chart important?
How do I use the baby age calculator to find my baby month calendar?
How many days old is my baby?
How many weeks old is my baby?
FAQ

Having a baby is a proud moment for any parent, and our baby age calculator helps you keep track of the milestones during those magical first couple of years! 👼 You will be able to find out how to calculate baby age by month and calculate how old your baby will be at different points of time.

This baby month counter provides you with a timeline of the all-important first couple of years of your newborn and shows how old they are in months. From the baby age chart, you will be able to tell how many months old your child is, based on the milestone dates, and also keep track of your baby using our baby percentile calculator

Why are baby month counter and baby age chart important?

The first few years of a baby's life are crucial since all newborns 👶 require extra care and attention during the initial months to enhance their growth and development. Some newborns less than 7 days old may also be susceptible to newborn hyperbilirubinemia. Vaccination 💉 schedules for newborns are also based on how many months old the child is. Several baby formulas (see baby formula calculator) also depend on the infant's age in months. The dosage of medications such as infant Tylenol dosag also depends on your baby's age. So it becomes pivotal to keep track of the baby age chart to get timely consultations.

As a bonus, if you're feeling whimsical 😉, you may enter your own birthdate in this ages and stages calculator to check when you were 6 months old or when you were 9 months old, and so on! You could also use this to compare the milestones of two babies based on their age difference!

Pet age
If you own pets, then you can also use this tool to find the milestones for your dogs 🐶, cats 🐱, or even bird🐦! Visit dog age calculator, cat age calculator, or bird age calculator for more information.

How do I use the baby age calculator to find my baby month calendar?

In order to calculate how old your baby is, all you need is just one thing:

Your baby's birthday!
Voila! A baby month calendar will be generated.
You will now be able to see how old your newborn will be on different dates.
You will also be able to see the day of the week in which each milestone falls, just in case you need to plan ahead for a party 🥂!

For example, if your baby was born on October 10, 2021, then the baby age chart will show the dates for months 1 through 24. From this baby month calendar, you can, for instance, calculate the 18 months milestone as Monday, April 10, 2023!

Alternatively, if your baby was born on June 19, 2021 for instance, and if today is October 15, 2021, you can find how many months old your child is (nearly 4 months old), by looking at the baby age chart. You may also use our korean age calculator for your baby!

If you are new to parenting then our diaper calculator will help you to take the guesswork out of your shopping needs.

How many days old is my baby?

To convert your baby's age from years to days, we will multiply the number of years by 365 since each year contains 365 days (366 days in the case of leap year). So, for example, when we convert two years to days, we get 2 × 365 = 730 days (if one of the years is a leap year, add 1 to the total number of days). This math will help you count how many days old your baby is!

The due date of delivery of a newborn is usually calculated based on the conception date. But sometimes, in case of premature delivery or similar scenarios, you could also check the adjusted age, gestational age, and chronological age for your infant.

How many weeks old is my baby?

What if you want to know how many weeks old your baby is? A typical calculation that works is multiplying the number of months by 4.345. So, for example, if your baby is 11 months old, it would mean that they are 4.345 × 11 = 47.795 weeks old or approximately 48 weeks old. This calculation will tell you how old your infant is in weeks.

You may also be interested to know that the age of your baby helps determine baby's milk intake requirement.

FAQ

How old is an 18 months baby?

An 18-month-old baby is 1.5 years old or approximately 550 days old. At this age, most babies can walk and also say basic words. It is also somewhat remarkable to see how an 18-month-old baby is old enough to go exploring around the house and start understanding what everyday objects 🥄 are used for. You can also calculate the 18 months milestone for your baby using this ages and stages calculator!

How many weeks old is an 8 month-old baby?

To know how many weeks there are in 8 months, we'd do the following:

A typical calculation that works is multiplying the number of months by 4.345.
So when we convert 8 months to weeks, we get 4.345 × 8 = 34.76 weeks.
This means the baby is approximately 35 weeks old!

This calculation will thus help you find how many weeks old an 8-month-old baby is!

How many weeks are in 13 months?

To know how many weeks is 13 months, a typical calculation that works is multiplying the number of months by 4. 345. So when we convert 13 months to weeks, we get 4.345 × 13 = 56.485 weeks or approximately 56.5 weeks.

How many months are in two years?

To determine how many months are in two years, we will multiply the number of years by 12 since each year contains 12 months. So when we convert 2 years to months, we get 2 × 12 = 24 months.

How do I calculate baby age in weeks to months?

To convert baby age from weeks to months, a typical calculation that works is dividing the number of weeks by 4.345. So, for example, let's say the baby is 35 weeks old. When we convert 35 weeks to months, we get 35 ÷ 4.345 = 8.055 or approximately 8 months. This way, you can find how old your newborn is in months.

How do I find the age of my baby 22 weeks from today?

We can convert a baby's age in weeks to months as follows:

Divide the number of weeks by 4. 345.
So when we convert 22 weeks to months, we get 22 ÷ 4.345 = 5.063.
This gives us approximately 5 months.
So to find how old your infant will be 22 weeks from today, you just need to add 5 months to the current age in months!

When will my baby be 500 days old?

One month typically has 30 days. So when we convert 500 days to months, we'll get 500 ÷ 30 = 16.67 months or approximately 17 months. So around 1 year 5 months of age is when your baby will be 500 days old!

Madhu Raman

Baby's birthdate

Check out 28 similar time and date calculators ⏳

Add timeAgeAge difference… 25 more

How To Calculate Baby's Age

How To Calculate Baby’s Age. How to know how many weeks translate to the number of months old a baby is and if you count from due date or birth date.

Many new moms find calculating the age of your baby slightly confusing. Your friend’s baby is 16 weeks old, while your cousin’s is 4 months old, yet that isn’t the same age. This post is just to quickly clarify that for anyone who needs to know.

You can count your baby’s age by days, weeks, and months. At some point, you move on to years, though I still didn’t say years with Brayden when he was almost three.

There are not only 4 weeks in a month (except February), so every 4 weeks of your baby’s life does not equal one month. Here is a quick chart reference:

4 Weeks = a couple of days shy of 1 month (it will depend on which month your child was born in)
8 Weeks = almost a week shy of 2 months
12 Weeks = one week shy of 3 months
13 Weeks = 3 Months old
16 Weeks = about a week and a half shy of 4 months old
17.5 Weeks = 4 months old
20 Weeks = about 2 weeks shy of 5 months old
22 Weeks = 5 months old
24 Weeks = 2-2. 5 weeks shy of 6 months old
26 Weeks = 6 months old

You can see from this list that 4 weeks does not equal one month. Both ages can indicate developmental milestones for you, so be sure you are comparing correct ages when looking at developmental milestones as well as Babywise milestones.

You want to move baby’s age up on the same day of the week he was born. So if your baby was born on a Thursday, then every Thursday he will get one week older.

The months, however, will move to the next month on the date of the birth even if the day of the week is not the same. So your baby born on Saturday the 14th will turn one month old on Tuesday the 14th even though it is a Tuesday.

If you want to make this easier on yourself to calculate the age of a person, this free age calculator will do the math and calculate your age in years, months, weeks, days, hours, minutes, and seconds. It doesn’t get much more precise than that.

Post Contents

Gestational Age or Birth Day
What Age Do You Tell People
Reader Comments
Reader Questions
Related Posts

Gestational Age or Birth Day

People often wonder if they should count how old baby is based on what gestational age said baby would be born (due date) or if you should count from baby’s actual birth date.

In other words, do we go by baby’s due date or by baby’s birth date?

When you are saying how old your baby is, you would start with 8 weeks. But many moms will say, “My baby is 8 weeks. 4 weeks adjusted.”

This means that the baby was born 4 weeks before the due date.

This age difference can seem weird to point out for those who haven’t had a baby born early. The birth date is a clear indicator for how old baby is. Birthdays don’t lie.

However, when you are considering how long to expect baby to be sleeping, how often baby should be eating, the milestones baby should be reaching, and which Wonder Weeks mom should be consulting, adjusted age can play a big role.

A general rule of thumb is if your baby was born premature, you consider the adjusted age of your baby when you do the calculation of how old baby is.

All three of my girls were born 3 weeks early.

Something I always tell people when I get asked the question “how old is my baby who was born early” is that they need to observe baby and see where baby seems to be.

A birth date calculated off of the due date is only as accurate as the due date was.

Due dates can be wrong.

Gestational age (how far along you are in pregnancy) is calculated based on the first day of your last menstrual period (LMP).

But that doesn’t necessarily tell you for sure when the conception date was.

Some women have 28 day cycles. Some have 30 day cycles. Some vary month to month. Most women do not know exactly when ovulation happened. So the first day of your last period last month might have been 29 days before the next cycle starts while mine might be 32 days.

I had two different doctors for my five pregnancies. One did Brayden, Braxston, and Kaitlyn. Then he moved and I had a different one for McKenna and Brinley.

My first doctor moved my due date back by one week with every pregnancy. My second doctor never did that.

My three girls were all born 3 weeks early.

So, was Kaitlyn really 2 weeks early? Or was McKenna really 4 weeks early?

The point is, due dates are estimates and not an exact science.

If your baby was born within one week of the due date, I would just go by birth date. I would probably do the same with up to two weeks early. I would do the same with a baby born late.

If your baby is 4 weeks early or earlier, I would do some adjusting of the age.

I find 3 weeks this in between. Observe your baby and see when the milestones are met and when wonder weeks seem to hit. You might find your baby, who was born 3 weeks early, seems to behave just 2 weeks younger than she is, not 3.

Look at all types of milestones. Look at the physical milestones (when does she roll over? When is that first social smile?) as well as schedule milestones (when can she sleep longer stretches? When can she go longer between feedings?) and the milestones you see with the Wonder Weeks.

What Age Do You Tell People

So at what ages do you give people when they ask?

I think that depends on your audience. When Brayden was a baby, I kept track of his weeks until he was a year old, then I moved to months until he was two. Then I did just turned two, almost 2.5, 2.5, close to three, almost three.

Once he hit three, I did number of years. But anyone who interacts with children knows that you always add in the half. A child is not simply 6 years old. He is “almost 6.5” or “6.5” or “almost 7.”

With Kaitlyn, I made things easier on myself. I kept track of weeks until she was about 4 months old, then I did months. I am moved to years as soon as she hit one year old.

If someone who doesn’t have young children asks how old my baby is, I do months. Weeks usually mean nothing to them. If it is a nurse or a doctor, I do weeks up to 4-6-ish months. If it is another mother who also has young children, I do weeks up to 3-4 months then do months.

My reasoning behind this is to give the person the answer they are looking for.

A childless person usually don’t know how to equate months with weeks, and before I had kids, I always wondered why my friend wouldn’t just tell me how many months her child was instead of weeks.

A doctor or nurse knows what needs to be happening with your child down to the week, so that is why I do weeks much longer. A week really can make a difference in the accomplishments of your child.

A baby who is 12 weeks old will have different milestones met than one who is three-months-old.

Another mother with young children has a point of reference with weeks, so that is why I do that with her for a while. That is what I do–but you do what you want.

Reader Comments

Reader Questions

Your Babywise Baby: First Year Overview
Babywise Milestones
When Baby Doesn’t Go by the Book
How To Do Babywise with a Preterm Baby

This post originally appeared on this blog May 2008

How much sleep does my child need?

The perception of day and night develops gradually ..

Each child has his own individual sleep habits and needs. Newborn babies, in particular, have no concept of daytime or nighttime during the first few weeks. There is not much that parents can do to help develop this habit.

You can support the child in his/her development, but the child will set the pace. Some babies have a strong natural rhythm. These children usually sleep through the night very early. Other children always feel hungry or tired at various times over the course of several months. They need the support of their parents to find some kind of pattern or enter into a rhythm that is acceptable for the whole family.

A regular, quiet daily routine with regular meals, sleep and other activities such as outdoor walks and others is important. Ordinary routine such as bathing, eating, leisure or lullabies may have a calming effect. Please remember to recharge your own energy reserves with a well-balanced diet, adequate fluid intake, and more breaks than usual throughout the day.

In the first weeks of life

In the first weeks, your baby seems to sleep most of the day. In fact, babies sleep about 18 hours a day, typically in 4-hour chunks, interrupted at times for drinks, diaper changes, and cuddles with their parents.

During the first 4-6 months

During the first 4-6 months, your baby learns to distinguish between day and night. The feeling of this rhythm is not innate. The biological clock is only set after birth, following the cues it receives from certain family routines. Over time, frequent short naps turn into longer periods of sleep. The wake-up time is also gradually expanding.

6 to 12 months

At 6 to 12 months, most babies sleep about 11 hours at night and twice a day for 1-1.5 hours. Short naps should not be longer because otherwise your child may have trouble sleeping at night.

Some parents feel uncomfortable waking their children because they think the body needs sleep. However, in order not to jeopardize a healthy rhythm, it is even better to wake children gently if they tend to sleep unusually long hours during the daytime. Isn't it better for a child to get angry after they wake up during the daytime than for them to wake up at night feeling refreshed and wanting to have fun? Use the time your child is awake during the day as an intensive time to be with your child and support their development. The longest period of wakefulness from 4 to 5 hours, should be until the evening before bedtime. It will also help your child fall asleep easily and sleep through the night.

During Year 2

During Year 2, children need about 13 hours of sleep a day. If you have 11 hours of sleep at night, there is still one hour left for your afternoon nap. Some begin to reduce daytime naps to one hour at noon at 10 months of age; Others until they are 18 months old.

During Year 3

The older children get, the less sleep they need. During the 3rd year, babies need about 12 hours of sleep. Many children give up the afternoon nap habit entirely, while others retain the habit until kindergarten.

Information for individual age groups

The following information for individual age groups uses averages. The individual need for sleep will vary from one child to another. Deviations of 1 to 2 hours are not a concern. Some children need even less sleep.

Age	Find out how much sleep your baby needs per day (24 hours)
Newborn	from 16 to 20 hours
3 weeks	from 16 to 18 hours
6 weeks	from 15 to 16 hours
4 months	from 9 to 12 hours at night and at night and at night and at night and at night and 2 days (2 - 3 hours each)
6 months	11 to 12 hours at night and 2 days (1 - 1. 5 hours each)

More from: Meal Plan Guide

and drinkingBaby digestionOn holiday with a childSleep

Eating right before bedSo your child will sleep soundly How much sleep does my child need? Does my child need food at night? When will my child start sleeping through the night? Sleep advice for your child

Dental care a year and 9 months to 2 years of age: what a child should be able to do

A child from 1 year and 9 months to 2 years of age: what he should be able to do

A 2-year-old child can already jump, run, walk up stairs, sit on a chair independently, and arrange objects.
At this age, fine motor skills are already well developed, the baby can string beads on a string, draw points, lines and specific shapes.
All toys for a two-year-old child can have buttons and keys - the baby will easily press them, examine, study.

What else should a child from 1 year and 9 months be able to do?

The baby can drink and eat independently with a spoon or fork. He may also undress or wash his hands.

The development of a child in the second year of life also includes the acquisition of certain imitative skills. At this age, your child will certainly be able to hug and pet a crying doll, treating her in the same way as adults with their children.

This is the time when the child begins to speak better and better. The two-year development of speech is systematic, he learns new words and tries to put them into short sentences.

The child is already beginning to realize that he is a separate person - this is manifested in the fact that he can notice and show himself in the mirror, recognize in a photo or video.

A two-year-old child is mobile, which means that his parents must be very careful and take care of his safety.

Child skills from 1 year and 9 months to 2 years:

Runs, jumps, climbs stairs with little help, sits down and gets up from a chair.
Can arrange objects in a row, move toys, arrange them.
Draws scribbles or imitates drawing.
Drinks from a cup, holds a spoon, uses a fork.
Understands and follows complex commands such as "go to the kitchen and get your own cup."
Knows the names of most objects that surround him.
Uses dozens of words, combines them into short, simple sentences.
Knows and uses some social actions, such as shaking hands.
Mimics simple actions seen before.

An important skill for development is "boasting" or attracting attention, a child can make a lot of effort to make adults look only at him.

The baby can also express his desire using simplified words, facial expressions and gestures. Some sources say that children around the age of 2 can use up to 200-500 words.

At this time, sensory-motor intelligence develops - the child learns the world with the help of feelings and movements.

Child height from 1 year and 9 months to 2 years - norms for boys and girls

The height of the child during this period, according to WHO:

Girls: 83.8 to 87.0 cm.
Boys: 85.0 to 88.1 cm.

Child weight from 1 year and 9 months to 2 years - norms for boys and girls

Girls: 10.5 to 12.2 kg.
Boys: 11.3 to 13.0 kg.

At this time, further intensive psychomotor development of the baby takes place, although physical development is no longer as dynamic as in the first year. A slowdown in weight gain is observed with continued rapid growth, the proportions of the body change - the figure of the child is losing weight.

Mental development of a child from 1 year and 9 months to 2 years

The child observes the environment and what he sees begins to express in his play or daily activities. The baby may try to help his mother with cleaning, for example, taking things out of the washing machine and imitating everyday worries - dusting, using a vacuum cleaner, using a mobile phone, etc.

The mental development of a child from 1 year and 9 months to 2 years is a period of isolation of his own boundaries and attempts at self-determination. A baby can want and not want at the same time, be very affectionate, and in a minute become moody and cry.

While playing on the playground, parallel play is still taking place - the child watches other children, but does not play with them. Sometimes conflict situations may arise - the baby may push another child or refuse to share toys.

The mental development of a child under 2 years old can be expressed in the appearance of embarrassment of some situations that previously caused him indifference. Many children at this age develop fears - fear of the dark or animals.

The baby slowly realizes his individuality, he feels the need for closeness and at the same time for independence. A lot of sensations create tension that the child cannot control, hence his extreme reactions - anger, crying, moodiness, a sharp change in mood.

A two-year-old child reacts very emotionally to everything, but he cannot control his emotions. He expresses dissatisfaction and lack of patience with the help of screaming, crying, throwing toys, he can pinch or bite his mother.

At this time, self-esteem (self-organization) develops. The child is happy to emphasize that "this is mine." He fiercely defends his toys from his peers, wants to have dinner using only his set of dishes, falls asleep with his favorite soft toy.

Child care from 1 year and 9 months to 2 years

A growing baby increasingly emphasizes his isolation, individuality, desire for independence. Parents often hear in communication with the child: “I myself”, “I can”, “no, I don’t want to”. It is important not to interrupt this development process with such comments: “I (an adult) will do it better, faster, more accurately”, “you are too small”, “children cannot do this”. Let your child do household chores, just watch and help him.

Most two-year-olds are already beginning to ask for a potty, but some still prefer a diaper, which is quite normal.

A two-year-old at home is a "marathon of obstacles" for parents. The baby is difficult to care for, but do not interfere with him to freely explore the world around him.

The activity and dynamism of the child testify to his correct development. All manifestations of apathy, excessive calmness, lethargy, lack of interest, or the constant repetition of the same actions (for example, constantly playing with the same toy) can be an alarm signal, and then it is worth talking to the pediatrician to dispel any doubts.

Advice for parents on caring for a 2 year old

Patience first. Nervous reactions won't help at all.
Remember that you are adults and do not react like children in a sandbox. Just because a child says “no” every time doesn’t mean they are intentionally pissing or teasing you. He's just trying to find his place in the world.
Sometimes you shouldn't insist on some simple things, like putting slippers on at home or wearing socks. Let your child make their own decisions.
Do not punish. To convince a stubborn and angry toddler of your point of view, introduce fun elements into everyday life. If your child doesn't want to sit in a chair for dinner, offer him another seat. Remember the most important rule - do not argue with a restless two-year-old, such disputes do not work. However, this does not mean that you should give the child complete freedom of action. The rules and foundations of coexistence must be clearly defined, explained and strictly observed by all those around the child. It's called consistency!

For a 2-year-old child, all kinds of activities are an important element of development - from simple manipulations to complex cartographic and even first creative activities. From now on, fun is an illustration of how children perceive the surrounding reality. Watching a child play gives information about what interests him, what he notices, what things are important to him.