Newborn’s Stomach Size Day 1-10 (Including Breastfeeding Tips)

When your baby is born, their stomach is the smallest it will be for their entire life! In fact, their stomach will slowly stretch over the first couple weeks of breastfeeding.

Still, you may feel like your breasts aren’t producing a lot of milk. Or, you may feel like that your baby isn’t getting enough milk in the first few days after birth. Truth be told, you’re not alone. But don’t worry! 

In the video below, Sarah Trinajstich talks about the development your baby’s stomach size and how to know if they’re getting enough milk.

If you don’t like the video or want more information, continue reading.

Below is exactly what you need to know about your newborn’s stomach size

When born, your baby's stomach is the size of a marble Day 1

At first, your baby’s stomach can hold about a teaspoon of breast milk or about the size of a large marble.

This is when your breasts produce a very small amount of colostrum – a golden substance, concentrated with the perfect nutrition to be your baby’s first meals.

At 3 days old, your baby's stomach is the size of a ping pong.Day 3

A few days in, your baby’s stomach will be able to hold about an ounce of breast milk or about the size of a ping-pong ball.

The amount of milk you make is increasing as your baby’s tummy grows and the milk begins to transition to mature milk.

At 10 days old, your baby's stomach is the size of an egg.

Day 10

Your baby’s stomach will be able to hold approximately 2 ounces of breast milk or about the size of a small egg.

By this time, your milk will be at full volume and fully transitioned from colostrum to mature milk. This brings comfort to most moms!

RELATED: 6 Steps For Getting a Comfortable & Effective Breastfeeding Latch

After 2 weeks of exclusive breastfeeding

Around this time your baby will go through a growth spurt and may seem hungry all the time! This does not mean that you are not making enough milk or that there is something wrong with your baby. Just keep putting your baby to the breast whenever they are showing hunger cues and you will make it through your baby’s first growth spurt.

Is your baby getting enough milk?

It is completely normal to wonder if your baby is getting enough milk. For reference, your baby should have at least 1 pee and poop diaper per a day of life during the first 5 days of life. After that, make sure your baby is having 6-8 wet diapers per a day that are light yellow without a strong smell.

Having 3-5 poop diapers is very normal

Having 3-5 poop diapers is normal, however, an exclusively breastfed baby can go several days without pooping. By about day 7, your baby’s poop should have transitioned to a mustard or golden yellow with little white pieces in it.

You will also notice your baby growing! Keep their tummy size in mind and have confidence that your body is built to give your baby exactly what it needs!

RELATED: 4 Signs Your Baby Is Hungry (and Needs To Be Fed)!

If you don’t hear your baby swallowing milk when breastfeeding or you cannot express milk from your breast, contact a certified lactation consultant.

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Sarah Trinajstich, RD, IBCLC
Hi, my name is Sarah Trinajstich. I'm a registered dietitian and an international board-certified lactation consultant. I received my bachelor's degree and completed my dietetic internship at California State University Long Beach. I then completed my lactation consultant education at the University San Diego Extension. I believe in the power of good nutrition from the moment of conception and the importance of breastfeeding, not only for babies nutrition but for the bonding and physical benefits to baby and mom. There is no greater satisfaction for me than to help a mother and her baby breastfeed successfully. Breastfeeding is more than what the body does without thinking. It involves skills that mom and baby learn together. I look forward to help ease the learning curve!