WeMoms
2 Apr 2024

What is the average baby weight by month?

Pregnancy
Baby's growth during pregnancy
What is the average baby weight by month?
Weight is one indicator of a baby’s physical development.
Children develop at different paces, but growth charts can provide a guide to how much a baby should weigh, on average.
Average Baby Weights:
  • Average birth weight for full-term male babies: 7 lb 6 oz or 3.3 kg.
  • Average birth weight for full-term female babies: 7 lb 2 oz or 3.2 kg.
  • Average weight range for babies born at 37–40 weeks: 5 lb 8 oz to 8 lb 13 oz or 2.5 to 4 kg.
  • Low birth weight at delivery: Less than 5 lb 8 oz or 2.5 kg.
  • Babies commonly lose around 10% of their birth weight after birth, usually due to fluid loss.
Baby Weight Chart by Age:
  • Birth:
Female: 7 lb 2 oz (3.2 kg)
Male: 7 lb 6 oz (3.3 kg)
  • 1 month:
Female: 9 lb 4 oz (4.2 kg)
Male: 9 lb 14 oz (4.5 kg)
  • 2 months:
Female: 11 lb 5 oz (5.1 kg)
Male: 12 lb 4 oz (5.6 kg)
  • 3 months:
Female: 12 lb 14 oz (5.8 kg)
Male: 14 lb 1 oz (6.4 kg)
What to Expect:
  • Babies experience rapid growth within the first 6 months, gaining around 4–7 oz (113–200 g) per week.
  • Weight gain slows slightly from 6 to 18 months, with an average gain of 3–5 oz (85–140 g) per week.
  • Babies usually triple their birth weight by their first birthday.
  • Growth patterns vary, and some babies experience growth spurts.
Factors Affecting Baby Weight:
  • Weight is not the sole indicator of development; length and head circumference also matter.
  • Babies grow at different rates and sizes, but steady growth is essential.
  • Baby's sex influences weight; males tend to be larger.
  • Nutrition plays a role, with breastfed babies initially gaining more weight than formula-fed babies.
  • Medical conditions can lead to slower weight gain.
  • Premature babies may grow and gain weight more slowly initially but often catch up by their first birthday.
Summary:
  • Average birth weights vary by sex and term.
  • Weight charts help track a baby's development but are just one aspect.
  • Doctors consider various indicators of growth, including milestones.
  • Medical history helps rule out factors affecting weight gain.
Remember that every baby is unique, and their growth trajectory may differ from the averages.
Regular checkups with healthcare professionals help monitor a baby's overall development and ensure they are thriving.
N
Nicole
24 Jan 2024

What's everyone else's 4 month old baby weight? Our daughter is 4 months and weighs 14 lbs 10.6 oz. She's even a couple oz bigger than that of an average 5 month old baby. We're so in love with our little munchkin!!!!!!!❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️

Pregnancy Baby's growth during pregnancy
10 comments
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Victoria
My Emma is 12lbs 12oz
27 Mar 2024

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Sha
At 4 months my son was 15lbs 2oz 25 inches long.
27 Mar 2024

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Kelsea
14 Nov 2023

Question for all the moms how much did your baby weigh while 25weeks pregnant? They are saying my baby is small but when i look up the average weight at 25weeks it days 1lb 7oz an that’s exactly what my daughter is weighing at now .

Pregnancy Baby's growth during pregnancy
8 comments
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Vaneliza
My doctor told me my baby boy is 1lb 9 onz at 23 weeks which she said was perfect. But for my first pregnancy my baby was 1 lb 0onz at 26 weeks and was born with 8 lb 5oz so don’t worry the last three months is where they go up.
27 Mar 2024

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Darla
They told me the same at last point. My baby 1 pound 7oz and said she was small but not worry because she has time to catch up
27 Mar 2024

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Arika
5 Oct 2023

My 9 month old is 15 lbs and 8 oz and 29 in what’s the average weight for a 9 month old

Pregnancy Baby's growth during pregnancy
6 comments
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♥️Maysons Momma♥️
My boy tho weights about 20 maybe a little over then 20 pounds
27 Mar 2024

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Arika
I didn’t quite know how to read this
27 Mar 2024

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Amber
8 Jun 2023

Had an ultrasound at 24 weeks and baby girl was measuring 1 pound 7 ounces and they said she was in 19th percentile in weight but when I look up the average weight for 24 weeks she would be a little above average, what did everyone else's babies weigh around there?

Pregnancy Baby's growth during pregnancy
6 comments
C
Carlie
Wow! That’s an amazing shot !!!
27 Mar 2024

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Jen
At 21 weeks is when i had my anatomy scan. He weight 518 grams which is 1.14lbs
27 Mar 2024

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Stephanie
31 May 2023

So my baby is above average on the growth chart. He’s weighing 4.5 lbs and that’s supposed to be his weight at 34 weeks. 😬😬

Pregnancy Baby's growth during pregnancy
1 comments
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🍹Jenni
4 Mar 2023

According to my pregnancy + app this is the size and weight of the average baby at 20 wks! I thought it baby was much smaller, it’s just amazing!!

Pregnancy Baby's growth during pregnancy
9 comments
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🍹Jenni
10.08 inches and almost 11oz
27 Mar 2024

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🍹Jenni
Yes I agree!
27 Mar 2024

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Blocked user
4 Dec 2022

34 weeks tomorrow! 6 more weeks to go! As of appointment yesterday baby is weighing 5lbs . Is this an Average weight I have a lot of people saying that she is going to be big?

Pregnancy Baby's growth during pregnancy
3 comments
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Rebecca
Yes im 33 weeks and my bby is weighing at 5lbs 8ounces as estimate but we'll see when they do another one later on. But congrats to you
27 Mar 2024

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Blocked user
Congratulations to u❤️
27 Mar 2024

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Myisha
14 Sep 2022

What is the average weight of a fetus at 29 weeks pregnant my last appointment last week i was 28 weeks pregnant and the baby was 2.6 pounds they said he was in the 10th percentile but I don’t think he’s way off based off of my research

Pregnancy Baby's growth during pregnancy
6 comments
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Blocked user
So glad you are researching
27 Mar 2024

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Myisha
This pregnancy has been so rocky and being a ftm google has been my Bestfriend lol
27 Mar 2024

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Talissa
2 Sep 2022

Question…how much is your babies weighing at 1 month? What was their birth weight? My daughter was a preemie and I want to see her growth!

Pregnancy Baby's growth during pregnancy
11 comments
B
Bella
My baby was born at 35 weeks 2 days so a preemie weighing 5lbs 4oz I took her with me after they said her tummy was healing well from surgery which was almost at 3 weeks and her weight was 6lbs 5 oz went the week after that to check her weight again and was weighing 7lbs 2oz. She had her intestines out so they did her surgery 4days after she was born (Friday ) and they didn’t feed her till that coming Friday. They said bc of her digestive problem she was doing really good with weight. I hope this month she weighs more I mean she feels heavier but I just want my baby healthy and growing 😩
27 Mar 2024

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Talissa
My daughter was born at 33 weeks she was 4.7lb and she was 5.10lb at her 1 week appointment and she has a rash so I took her Wednesday and she weighs 6.7lb and she will be a month tomorrow!
27 Mar 2024

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Karina
11 May 2022

I swear baby clothes should go by weight not months. My 3 month old is 16.2 lbs and he's wearing 6 to 9 month old clothes. There is no way he would fit in a 3 month old clothes lol #

Pregnancy Baby's growth during pregnancy
4 comments
B
Britney
And my baby is 3 months still wearing newborn 0-3 is a little to big for her
27 Mar 2024

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D
Danielle
I agree my son is also 3 months in 6-9 months
27 Mar 2024

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