Newborns start with surprisingly tiny feedings and work their way up quickly. On the first day of life, a baby’s stomach holds only about 1 to 1.5 teaspoons (5 to 7 ml) per feeding. By day 10, that capacity grows to roughly 2 to 2.75 ounces (60 to 81 ml) per feeding. Whether you’re breastfeeding or formula feeding, expect to feed your newborn 8 to 12 times every 24 hours in those early weeks.
How Stomach Size Shapes Early Feedings
A newborn’s stomach is about the size of a cherry on day one. That’s why those first feedings are measured in teaspoons, not ounces. By day three, the stomach has expanded enough to hold 4.5 to 5.5 teaspoons (22 to 27 ml) per feeding. By day 10, your baby can take in 2 to 2.75 ounces at a time. This rapid growth continues: by 3 to 4 months, most babies handle about 4 ounces per feeding comfortably.
This progression means you shouldn’t worry if your baby takes very little in the first 48 hours. Those tiny early meals are perfectly matched to what their stomach can hold. Trying to push more formula or milk than the stomach can accommodate often leads to spit-up rather than extra nutrition.
Formula Feeding: Amounts and Frequency
If your baby is exclusively formula-fed, the CDC recommends starting with 1 to 2 ounces of formula every 2 to 3 hours in the first days of life. That works out to 8 to 12 feedings over a 24-hour period. Yes, that includes overnight.
Over the first few weeks, babies gradually stretch the time between feedings. Most formula-fed infants settle into a pattern of eating every 3 to 4 hours. As feedings become less frequent, the volume per bottle increases to compensate. A useful upper benchmark: babies who take in about 32 ounces or more of formula per day are generally getting all the nutrition they need, including enough vitamin D without a separate supplement.
Breastfeeding: Frequency Over Volume
With breastfeeding, you can’t measure ounces the way you can with a bottle, so frequency becomes your primary guide. Plan on 8 to 12 breastfeeding sessions in 24 hours. Some of those sessions will be long, others surprisingly quick. Both are normal.
The composition of breast milk also changes throughout a feeding. The milk your baby gets at the start is thinner and quenches thirst, while the milk toward the end of a session is fattier and more calorie-dense. Letting your baby finish on one breast before offering the other helps ensure they get that higher-calorie milk.
Breastfed babies (and babies receiving a mix of breast milk and formula) need a daily vitamin D supplement of 400 IU, starting shortly after birth. Breast milk alone doesn’t provide enough vitamin D regardless of the mother’s diet.
How to Tell Your Baby Is Getting Enough
Since you can’t always measure what a breastfed baby takes in, diapers become your best tracking tool. By days 4 through 7, a well-fed newborn produces at least six wet diapers and three dirty diapers per day. Fewer than that warrants a conversation with your pediatrician.
Weight is the other key indicator. Most newborns lose some weight in the first few days, which is completely expected. About 80% of babies regain their birth weight by two weeks of age, with the upswing starting around days 3 to 5. A weight loss of more than 10% of birth weight, or slow recovery back to birth weight, signals that feeding needs closer evaluation.
Reading Your Baby’s Hunger and Fullness Cues
Newborns communicate hunger well before they start crying. Early hunger signs include putting their hands to their mouth, turning their head toward your breast or the bottle (called rooting), puckering or licking their lips, and clenching their fists. Crying is actually a late sign of hunger, and a very upset baby can have a harder time latching or settling into a feeding.
Fullness looks different. A satisfied baby will close their mouth, turn their head away from the breast or bottle, and visibly relax their hands. These signals are worth paying attention to. Feeding on demand, guided by your baby’s cues rather than a strict clock, generally leads to better intake than trying to force a rigid schedule in the newborn period.
Growth Spurts and Cluster Feeding
Just when you think you’ve figured out a pattern, your baby will suddenly want to eat constantly. These bursts of increased appetite typically happen around 2 to 3 weeks, 6 weeks, 3 months, and 6 months of age. During a growth spurt, your baby may want to feed every hour for a stretch of several hours, often in the evening. This is called cluster feeding.
Cluster feeding can feel alarming, especially for breastfeeding parents who worry their supply is dropping. It’s not. The frequent nursing actually signals your body to produce more milk to keep up with your growing baby’s needs. These intense periods usually last 2 to 3 days before feeding patterns settle back down. For formula-fed babies, a growth spurt simply means offering an extra ounce per bottle or feeding more frequently for a few days.
A Quick Reference by Age
- Day 1: 1 to 1.5 teaspoons per feeding, 8 to 12 feedings per day
- Day 3: 4.5 to 5.5 teaspoons per feeding, 8 to 12 feedings per day
- Day 10: 2 to 2.75 ounces per feeding, 8 to 12 feedings per day
- 3 to 4 months: About 4 ounces per feeding, every 3 to 4 hours
These are averages. Some babies consistently eat a little less per feeding but eat more often, and others take larger bottles with longer stretches in between. As long as your baby is gaining weight steadily, producing enough wet and dirty diapers, and seems content between feedings, they’re getting what they need.