A newborn takes about 5 to 7 milliliters (roughly a teaspoon) per feeding on the first day of life, increasing to 3 to 4 ounces (90 to 120 ml) per feeding by around 4 to 5 weeks. The amount changes rapidly in those first weeks because your baby’s stomach is growing just as fast.
Day-by-Day Stomach Growth
Your newborn’s stomach on day one is about the size of a cherry and holds only 5 to 7 ml of milk. That tiny capacity is why colostrum, the thick first milk your body produces, comes in such small amounts. Your baby needs only about an ounce of colostrum total per day, spread across 8 to 10 feedings, so each session delivers roughly a teaspoon.
By 72 hours, the stomach has stretched enough to hold about 1 ounce (30 ml) per feeding. At one week, it’s the size of an apricot, fitting 45 to 60 ml (1.5 to 2 ounces). And by one month, the stomach is closer to the size of an egg, holding 80 to 150 ml (roughly 2.5 to 5 ounces) per session.
Here’s the general progression:
- Day 1: 5 to 7 ml (1 teaspoon)
- Day 3: about 1 ounce (30 ml)
- Day 7: 1.5 to 2 ounces (45 to 60 ml)
- 1 month: 2.5 to 5 ounces (80 to 150 ml)
- 4 to 5 weeks: peak volume of about 3 to 4 ounces (90 to 120 ml) per feeding
Most babies reach a peak daily intake of about 30 ounces (900 ml) around that 4- to 5-week mark. After that, total daily volume stays relatively stable for months, even as the baby grows, because breastmilk composition changes to match the baby’s needs.
How Often Newborns Feed
The American Academy of Pediatrics recommends 8 to 12 feedings in every 24-hour period for newborns. During the day, your baby should not go longer than about 2 to 3 hours between feedings. At night, the maximum stretch is around 4 hours. If your baby is sleeping past these windows, wake them to feed.
Each feeding should last as long as your baby is actively sucking. There’s no set time limit. Let your baby stay at the breast until they seem full and detach on their own. For most newborns, that takes anywhere from 10 to 20 minutes per side, though this varies widely.
Figuring Out Bottle Amounts
If you’re feeding expressed breastmilk from a bottle, the math is straightforward. Divide 25 ounces (750 ml) by the number of times your baby feeds in 24 hours. If your baby typically eats 8 times a day, that’s about 3 ounces (94 ml) per bottle. If they feed 10 times a day, each bottle would be closer to 2.5 ounces.
During the first week specifically, most full-term babies take no more than 1 to 2 ounces per bottle feeding. Starting with smaller amounts helps avoid overfeeding, since babies can drink faster from a bottle than from the breast. Offer a small amount first, and let your baby tell you if they want more.
Hunger and Fullness Signals
Because breastfeeding doesn’t come with measurement lines, your baby’s behavior is your best guide. Early hunger cues include sucking on their hands, rooting (turning their head and nuzzling toward your chest), smacking or licking their lips, and becoming more alert. If those cues are missed, babies escalate to opening and closing their mouth repeatedly, squirming, and making excited sounds. Crying is actually a late hunger signal, not an early one. Feeding is easier and calmer if you catch the earlier signs.
Fullness looks different. In the first six months, the most common early signs that your baby has had enough are falling asleep, relaxing their muscle tone, and slowing or pausing their sucking. When actively full, babies will detach from the nipple on their own, turn away, or push back. Trust these signals. A baby who falls asleep at the breast and releases the nipple is telling you they’re done.
Cluster Feeding and Growth Spurts
There will be stretches when your baby seems to want the breast constantly, sometimes nursing every 30 minutes for several hours. This is cluster feeding, and it typically shows up around 2 to 3 weeks, 6 weeks, 3 months, and 6 months. It can feel alarming, like your baby isn’t getting enough, but this pattern is normal. It’s your baby’s way of signaling your body to increase milk production to match their growing needs. Growth spurts usually last a few days and then feeding patterns settle back down.
Signs Your Baby Is Getting Enough
Since you can’t measure what goes in during breastfeeding, you measure what comes out. By days 4 through 7, a well-fed newborn produces at least six wet diapers and three dirty diapers per day. The wet diapers should feel heavy, and the stools will shift from dark, sticky meconium to a yellow, seedy texture as your milk transitions from colostrum to mature milk.
Weight gain is the other reliable marker. In the first few months, breastfed babies gain about 1 ounce (28 grams) per day. It’s normal for newborns to lose up to 7 to 10 percent of their birth weight in the first few days, then regain it by around 10 to 14 days. Your pediatrician will track weight at each visit, and that trend line matters more than any single feeding volume. If your baby is producing enough diapers, gaining weight steadily, and seems satisfied after feeds, they’re getting what they need.