A newborn’s stomach holds just 5 to 7 ml (about one teaspoon) on day one of life, so feedings start tiny and increase quickly. By the end of the first month, most babies take 80 to 150 ml (3 to 5 ounces) per feeding. The exact amount depends on your baby’s age in days, whether they’re breastfed or formula-fed, and their weight.
Stomach Size Sets the Limit
A newborn’s stomach is remarkably small and grows rapidly over the first few weeks. That physical size is the main reason feeding volumes change so fast early on.
- Day 1: The stomach holds about 5 to 7 ml, roughly the size of a cherry. One teaspoon per feeding is normal.
- Day 3: Capacity jumps to 22 to 27 ml, about the size of a walnut.
- One week: The stomach holds 45 to 60 ml (1.5 to 2 ounces) per feeding.
- One month: Feedings reach 80 to 150 ml (3 to 5 ounces).
These volumes are averages. Some babies consistently take a bit less per feeding and eat more frequently, while others take more and go longer between sessions. Both patterns are normal as long as weight gain stays on track.
Breastfed Newborns: The First Days
For the first two to three days, your breasts produce colostrum, a thick, concentrated early milk. Newborns only need about one ounce of colostrum total per day, which works out to roughly a teaspoon per feeding spread across 8 to 10 sessions. That sounds like almost nothing, but colostrum is extremely nutrient-dense and matches the tiny stomach capacity perfectly.
Mature milk typically comes in around days three to five. As it does, your baby’s stomach has already started expanding, and they’ll begin taking larger volumes at each feeding. By one week, most breastfed babies take 45 to 60 ml per session. You won’t be measuring this directly since milk transfers straight from breast to baby, but you can tell things are going well by counting wet and dirty diapers and watching for steady weight gain at checkups.
Breastfed newborns eat frequently: 8 to 12 times in 24 hours, or roughly every 2 to 3 hours. This frequency is normal and necessary. Because breast milk digests quickly, shorter intervals between feedings don’t mean your supply is low.
Formula-Fed Newborns: Volume by Age
Formula feeding makes it easier to track exact volumes. The CDC recommends starting with 1 to 2 ounces (30 to 60 ml) every 2 to 3 hours in the first days of life. From there, volumes increase as the stomach grows.
A reliable way to estimate your baby’s daily needs is by weight: about 75 ml (2.5 ounces) per day for every pound your baby weighs. So a 7-pound baby needs roughly 525 ml (about 17.5 ounces) total per day. Divide that by the number of feedings (typically 8 to 10 in the early weeks, dropping to 6 to 8 by one month) to get the per-feeding amount.
By the time babies are a bit older and settled into a routine, formula-fed infants generally consume 120 to 180 ml (4 to 6 ounces) per feeding and take in 720 to 960 ml (24 to 32 ounces) per day total. Your baby’s hunger cues, not a fixed schedule, should guide how much goes into each bottle.
How to Read Hunger and Fullness Cues
Pediatric guidelines consistently emphasize using your baby’s behavioral signals over hitting a specific ml target. Babies communicate hunger and fullness through clusters of cues rather than a single sign, so look for patterns rather than reacting to one movement.
Hunger cues in the first three months include rooting (turning the head with an open mouth), bringing hands to the mouth, and fussing or lip-smacking. Crying is a late hunger cue, so ideally you’ll catch the earlier signals first.
Fullness cues are equally important, especially with bottle feeding where it’s tempting to encourage “just one more sip.” A full baby will slow or stop sucking, turn their head away from the nipple, relax and extend their fingers, arch away, or fall asleep. When you see several of these together, the feeding is done, even if there’s milk left in the bottle.
Growth Spurts Change the Pattern
Just when you think you’ve figured out your baby’s feeding rhythm, a growth spurt can throw it off. These typically happen around 2 to 3 weeks, 6 weeks, 3 months, and 6 months of age. During a spurt, babies become fussier and want to eat more often, sometimes as frequently as every 30 minutes for breastfed infants.
This increased demand usually lasts two to three days. For breastfeeding parents, the extra nursing sessions signal your body to produce more milk to match the baby’s growing needs. For formula-fed babies, you may need to offer an extra ounce per bottle or add an extra feeding or two during those days. Once the spurt passes, the schedule typically settles back down.
Signs You’re Overfeeding
Overfeeding is more common with bottles than with breastfeeding, because milk flows from a bottle whether or not the baby is actively hungry. When a baby takes in more than their stomach can comfortably handle, the excess causes gas, belly discomfort, excessive spit-up, loose stools, and increased crying. In babies who already have colic, overfeeding can make episodes more frequent and intense.
To reduce the risk, use paced bottle feeding: hold the bottle more horizontally, let the baby take breaks, and stop when fullness cues appear. Resist the urge to finish a bottle just because there’s still formula in it. A baby who regularly drains every bottle and still seems hungry may need a slightly larger volume, but jumping up too fast in ounces can overshoot their stomach capacity.
Late Preterm Babies Need Smaller Amounts
Babies born between 34 and 38 weeks often have a harder time feeding than full-term infants. They tend to be sleepier, tire more quickly during feeds, and have less coordinated sucking and swallowing. Their feeding volumes start even smaller: 5 to 10 ml per feeding on day one, increasing to 10 to 30 ml per feeding in the days after.
These babies may need supplementation with expressed breast milk, donor milk, or formula after breastfeeding attempts, and they often require more frequent wake-ups for feeds since they’re less likely to signal hunger on their own. If your baby was born early, your pediatrician or NICU team will give you a personalized feeding plan with specific volumes to target.