Your baby's stomach is way smaller than you'd guess, which explains why they want to eat around the clock in those early weeks.
A baby’s stomach size is much smaller than many parents expect. Some studies suggest a baby's stomach is about the size of a marble on day one.1 That explains why those early weeks feel like non-stop snack time! By learning more about stomach size by age and how babies' digestive systems grow, you can have a better idea of how much to feed your little one and feel confident they're getting enough.
Newborn stomachs are incredibly small, which is why they need to eat so often. Here's how a baby's stomach size typically evolves during their first weeks, but your baby may vary.2
With a tummy that small, frequent feeds are completely normal. Your baby's stomach stretches a bit with each feeding but empties quickly, meaning they'll feel hunger pangs soon after.
As babies grow, so does their stomach capacity. The size of a two-week-old baby's stomach is far different than the size of a baby's stomach at two months. Here's a baby stomach size chart by month showing approximate maximum capacity:2,3
| Age | Approximate Capacity |
|---|---|
| Newborn (Day 1) | 5-7 mL (1-2 tsp) |
| 1 Week | 45-60 mL (1.5-2 oz) |
| 1 Month | 80-150 mL (2.5-5 oz) |
| 3-6 Months | 175-235 mL (6-8 oz) |
Frequent feeding matches your baby's biology. Here are ways to improve your baby's feeding experience as they grow:
Most babies' feeding patterns are totally normal given their tiny baby stomach size, but trust your gut if something feels off. Contact your pediatrician if you notice:
Your pediatrician can check whether your baby's feeding matches their stomach size and tweak things as needed. That's especially important if you have a premature baby with extra nutritional needs.
Your baby's stomach may start as marble-sized, but every small feed adds up to support their incredible growth. As their digestive system develops, you'll be able to feed them confidently. For even more of a confidence boost, join Enfamil Family Beginnings® for personalized feeding tips, growth trackers, and savings that support your little one's tummy timeline from day one.
As with most things, practice makes perfect—and rest assured, you’ll get plenty of diaper-changing practice those first couple of years. In no time you’ll be a pro and be able to tackle your baby’s diaper with confidence. For more tips and resources on all things baby, including nutrition and feeding, be sure to join Enfamil Family Beginnings®. Enjoy up to $400 in savings, plus exclusive rewards, support, and surprises.
All information on Enfamil, including but not limited to information about health, medical conditions, and nutrition, is intended for your general knowledge and is not a substitute for a healthcare professional's medical identification, advice, or management for specific medical conditions. You should seek medical care and consult your doctor or pediatrician for any specific health or nutrition issues. Never disregard professional medical advice or delay seeking medical treatment, care, or help because of information you have read on Enfamil.
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