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

What You Need To Know About Your Newborn's Stomach Size

When your baby is born, their stomach is the smallest it will ever be! Their stomach will slowly stretch over the first weeks of breastfeeding.

However, you may feel like your breasts aren’t producing a lot of milk, or you may feel that your baby isn’t getting enough milk. You’re not alone. No need to worry! 

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

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 marbleDay 1

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

Your breasts produce a 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 increases as your baby’s tummy grows. 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 transitioned from colostrum to mature milk. 

RELATED: Breast Engorgement: How To Prevent (and Survive) This Painful Condition

After 2 weeks of exclusive breastfeeding

Around this time, your baby will go through a growth spurt and may seem hungry all the time. Fear not – this doesn’t mean that you’re not making enough milk, or that there’s something wrong with your baby. Keep putting your baby to the breast whenever they’re showing hunger cues and you’ll make it through your baby’s first growth spurt! 

Is your baby getting enough milk?

It’s entirely normal to wonder if your baby is getting enough milk. For reference, your baby should have at least one pee and one poop diaper per day during the first five days of life. After that, make sure your baby has 6-8 wet diapers per day. Each diaper should be light yellow and without a pungent 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 color with little white pieces in it.

You’ll 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 can’t 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!

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