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How big is a newborn’s stomach?

Updated May 6, 2023 – One of the challenges of being a new parent is that newborns and infants seem to be eating constantly, and yet we worry they’re not getting enough! Newborn breastfeeding and bottlefeeding is frequent because our babies can only take in small amounts at a time. This blog answers the question… How big is a newborn’s stomach?

Small, frequent feeds, sometimes up to 12 feeds per 24 hour period, are the norm in baby’s first weeks. If it feels like, All I’m doing is nursing/feeding! then you’re doing everything right. For breastfeeding moms, milk typically “comes in” on about day four or five after baby’s birth but the fact is that colostrum and milk are already being received before then.

Remember, baby only drinks a cherry-sized amount at each feed. Also skin to skin contact with baby not only stimulates interest in feeding but helps both baby and parents in so many other healthy ways!

While there are teams of experts in newborn care, your baby is the real expert in how much to eat! Here’s the volume of an average newborn’s stomach so you can feel prepared for just how little and how frequently babies eat.

As our postpartum doula and night nannies like to say: if it seems like the newborn feeding schedule is that you’re always feeding you newborn, you’re doing it right.

How big is a newborn’s stomach? – a Visual

How big is a newborn's stomach?
How big is a newborn’s stomach?

Things to Remember

  • Breastfeeding: One particular piece of advice to remember if you’re nursing is that milk doesn’t “come in” right away. It may seem like baby is not getting enough to eat but skin to skin contact and sucking are what helps milk to come in. Remember, breastmilk works on a supply and demand so it makes sense that your milk supply might seem to not be where your newborn needs it to be yet. Of course ask your pediatrician or lactation counselor if you’re worried. If you have other questions about early breast or bottle feeding, Your First Night Home may help.
  • Bottle feeding: For bottle feeding families, remember that the speed of the bottle’s nipple and amount of formula will effect how much your newborn takes in. Don’t be tempted to have baby drain the pre-made hospital bottles from the hospital. They contain WAY TOO MUCH formula for a newborn. It’s easy to overfeed from a bottle because baby can’t naturally start and stop the flow. So even though our urge might be to feed, feed, feed and not waste any formula, refer to the chart above to give baby the correct amount of food.
  • Sleep: Conventional wisdom still tells us to tank baby up to sleep. This can be true for older babies (and adults!) but as our postpartum doula and night nanny team tell parents, overfeeding does not help newborns sleep soundly. In fact, feeding too much usually causes unnecessary spit up and gastric discomfort. It’s perfectly normal for newborns to eat every 2 and then stretch to every 3 hours in their first weeks.
  • The Pediatrician: Take comfort in knowing that in addition to the doctors and nurses, your pediatrician will visit while baby is in the hospital or birthing center. You’ll also visit the ped’s office again when baby is between 3 and 5 days old. The hospital won’t allow discharge unless they’re completely confident that your family is healthy and well. You have a whole team looking out for baby.

How big is a newborn’s stomach? – Wet and Soiled Diapers

It might be hard to know how much baby is consuming during each feeding session. That’s okay though because you’ll always be able to monitor how much is coming out. All babies are different, but tracking the amount of wet and soiled diapers each day for the first week is another way to monitor that baby is feeding well. You can always drop in to your pediatrician for a weight check as well.

how many Newborn Diapers to expect

Birth weight, prematurity, congestion or growth spurts can all contribute to normal feeding behavior for baby at any given time. On the whole, weight gain, diaper output and baby appearing satisfied and content after feeding are all the infants way of telling you they’re happy no matter how big their stomach is. By following your newborns lead and contacting the pediatrician with any concerns you can ensure your baby is eating enough.