In the first week of life, babies drink just 1 to 2 ounces per feeding. That amount climbs steadily over the following months, peaking around 6 to 8 ounces per feeding before solid foods begin replacing some of those calories. The exact volume depends on your baby’s age, weight, and whether they’re breastfed or formula-fed.
Why Newborns Start With So Little
A newborn’s stomach is remarkably small. On day one, it holds roughly 1 to 1.5 teaspoons (5 to 7 milliliters) per feeding. By day three, capacity grows to about 4.5 to 5.5 teaspoons (22 to 27 milliliters). At day ten, the stomach can hold 2 to 2.5 ounces (60 to 81 milliliters). This rapid but measured expansion is why newborns need to eat frequently, often 8 to 12 times in 24 hours, rather than taking in large volumes at once.
By three or four months, stomach capacity reaches about 4 ounces (118 milliliters) per feeding. Growth slows considerably after the first ten days, so the jump from “marble-sized” to “small egg-sized” happens mostly in that initial stretch.
Milk Intake From Birth to 6 Months
A useful rule of thumb for formula-fed babies: they need about 2.5 ounces of formula per day for every pound of body weight. So a 10-pound baby would drink roughly 25 ounces across the day. Here’s how feeding volumes typically progress:
- First week: 1 to 2 ounces per feeding, 8 to 12 feedings per day
- 2 months: 5 to 6 ounces per feeding, 5 to 6 feedings per day
- 3 to 5 months: 6 to 7 ounces per feeding, 5 to 6 feedings per day
Breastfed babies are harder to measure in ounces because milk transfers directly. Instead, the best indicators that a breastfed baby is getting enough are steady weight gain and diaper output. After day five, a well-fed newborn produces at least six wet diapers per day and has regular bowel movements.
Some feedings will be long and leisurely, others surprisingly quick. Babies generally take what they need and stop when they’re full. There’s no single “correct” number of ounces at any given feeding.
6 to 12 Months: When Solids Enter the Picture
Once complementary foods start (typically around 6 months), milk remains the primary calorie source but gradually shares the plate. Between 8 and 12 months, babies need roughly 750 to 900 calories a day, and about 400 to 500 of those calories should still come from breast milk or formula. That works out to approximately 24 ounces (720 milliliters) of milk per day.
The shift is gradual. At 6 months, solids might be just a few spoonfuls of pureed food alongside full milk feedings. By 12 months, your baby is eating three small meals with snacks, and milk feedings naturally decrease to fill in the nutritional gaps rather than dominate the diet.
After 12 Months: Switching to Cow’s Milk
Most children transition from formula or breast milk to whole cow’s milk around their first birthday. The recommended limit is no more than 2 cups (500 milliliters, or about 16 ounces) per day from all milk sources combined. Drinking more than that is a recognized risk factor for iron deficiency anemia, because toddlers who fill up on milk tend to eat less of the iron-rich foods they need.
This cap applies to the total from cow’s milk, breast milk, and any remaining formula. If your toddler still nurses a few times a day, those volumes count toward the 2-cup daily limit.
How to Tell if Your Baby Is Getting Enough
Tracking ounces is one approach, but your baby’s own signals are more reliable day to day. Hunger cues show up before crying: fists moving to the mouth, head turning to look for the breast, increased alertness, sucking on hands, and lip smacking. Crying is actually a late sign of hunger and more of a distress signal than a first request.
Fullness cues are equally clear. A satisfied baby releases the breast or bottle nipple, turns their head away, relaxes their body, and opens their fists. Trying to push past these signals by encouraging “just one more ounce” can override a baby’s natural appetite regulation.
For breastfed newborns, diaper counts serve as a practical daily check. Before day five, the expected number of wet and dirty diapers climbs each day roughly matching the baby’s age in days. After day five, at least six wet diapers in 24 hours signals adequate intake. Consistent weight gain at regular pediatric checkups confirms the bigger picture.
Why Individual Variation Is Normal
The numbers above are averages, and healthy babies routinely fall above or below them. A baby going through a growth spurt might suddenly want to eat every hour for a day or two, then settle back into a more spaced-out pattern. Illness, teething, and developmental leaps can all temporarily change how much milk a baby wants.
What matters more than hitting an exact ounce target is the overall trend: steady weight gain along the baby’s own growth curve, enough wet diapers, and a baby who seems satisfied after most feedings. Babies who consistently drain their bottles and still seem hungry may need a slight increase in volume per feeding, while babies who routinely leave an ounce behind are telling you the portion is slightly too large.