A newborn drinks surprisingly little milk in the first days of life, starting at just 2 to 10 milliliters (less than half an ounce) per feeding on day one and gradually increasing to 3 to 5 ounces per feeding by the end of the first month. This progression matches the rapid growth of a baby’s stomach, which starts about the size of a cherry and expands to roughly the size of an egg within four weeks.
Breastmilk Intake by Age
Here’s what to expect at each stage during the first six weeks:
- Day 1: 2 to 10 ml per feeding (under half a teaspoon to about 2 teaspoons). Stomach capacity is roughly 5 to 7 ml, about the size of a marble.
- Day 2: 5 to 15 ml per feeding (1 to 3 teaspoons).
- Day 3: 15 to 30 ml per feeding (0.5 to 1 ounce). Stomach capacity has grown to about 22 to 27 ml.
- Day 7: 1 to 2 ounces per feeding, totaling 10 to 20 ounces over 24 hours. Stomach holds 45 to 60 ml (1.5 to 2 ounces).
- Weeks 2 to 3: 2 to 3 ounces per feeding, totaling 15 to 25 ounces per day.
- Weeks 4 to 5: 3 to 4 ounces per feeding, totaling 24 to 30 ounces per day. Stomach capacity is now 80 to 150 ml (3 to 5 ounces).
These numbers are averages. Individual feedings vary throughout the day. Your baby might take 1.5 ounces at one session and 3 ounces at the next, and that’s completely normal. The 24-hour total matters more than any single feeding.
How Often Newborns Feed
Most newborns breastfeed 8 to 12 times in a 24-hour period. That works out to roughly every 2 to 3 hours, though the spacing won’t be even. Babies often cluster their feedings, nursing every 30 minutes to an hour during certain stretches, particularly in the evening. This is normal and doesn’t mean your supply is low.
Because a newborn’s stomach is so small in the first few days, frequent small feedings are exactly what their body is designed for. The tiny volumes of colostrum (the thick early milk produced before your mature milk comes in) are a perfect match for a stomach that holds less than a tablespoon.
Growth Spurts and Increased Demand
Around 2 to 3 weeks old, your baby will likely hit the first growth spurt. During these periods, babies want to nurse more often and for longer stretches than usual. This can feel alarming, but the extra nursing signals your body to produce more milk. Another growth spurt typically happens around 6 weeks, then again at 3 months and 6 months.
Growth spurts usually last a few days. If your baby suddenly seems unsatisfied after feedings or is waking more frequently to eat, this is the most likely explanation.
How to Tell Your Baby Is Getting Enough
When you’re breastfeeding directly, you can’t measure volume the way you can with a bottle. Diaper output is the most reliable day-to-day indicator that your baby is eating well. Here’s what to look for in the first week:
- Day 1: At least 1 wet diaper and 1 dark, tarry stool.
- Day 2: 2 to 3 wet diapers and 1 to 2 stools (transitioning from black to greenish).
- Days 3 to 4: 3 to 4 wet diapers and at least 3 stools (green to yellow, softer).
- Day 5 onward: 6 or more wet diapers and at least 4 yellow, seedy stools per day.
Only count stools that are larger than a quarter. The shift from dark, sticky meconium to yellow, seedy stools over the first few days is a good sign that your baby is taking in enough milk as your supply transitions from colostrum to mature milk.
Weight Changes in the First Two Weeks
Nearly all newborns lose some weight in the first few days after birth. This is expected. Most babies begin regaining weight between days 3 and 5, and about 80% are back to their birth weight by 2 weeks old. A weight loss of up to 7 to 8% is typical. If a baby loses more than 10% of birth weight, that warrants a closer look at feeding and may call for additional support from a lactation consultant or pediatrician.
Recognizing Hunger Cues
Crying is actually a late sign of hunger, not an early one. By the time a baby is crying from hunger, they’re already distressed, which can make latching harder. Watch instead for the earlier signals: fists moving toward the mouth, head turning as if searching for the breast, lip smacking, sucking on hands, and becoming more alert and active. Feeding at these first signs tends to make nursing sessions smoother for both of you.
Bottle Feeding Expressed Breastmilk
If you’re pumping and feeding expressed milk by bottle, the same volume guidelines apply. The difference is that bottles deliver milk faster than the breast, which makes it easier for a baby to take in more than their stomach comfortably holds. Paced bottle feeding, where you hold the bottle more horizontally and let the baby take breaks, helps prevent overfeeding.
Signs that a baby has had too much at once include spitting up, gassiness, and visible discomfort. Let your baby pause during the feeding and stop when they show signs of fullness, like turning away from the bottle, relaxing their hands, or falling asleep. For babies between 1 and 6 months old, individual bottles of 3 to 4 ounces are a good starting point, with a daily total of 24 to 30 ounces. Offering smaller, more frequent bottles mirrors the natural rhythm of breastfeeding better than fewer large ones.