Most newborns eat between 15 and 25 ounces of breast milk or formula per day by the end of their first few weeks. But that number starts much lower and climbs quickly, because a newborn’s stomach grows dramatically in the first month of life. Rather than hitting one fixed target, your baby’s intake will shift almost daily during those early weeks.
How Stomach Size Shapes Daily Intake
A newborn’s stomach on day one holds roughly 5 to 7 milliliters, about one teaspoon. That’s why the first feedings are tiny and frequent. By day three, capacity jumps to around 22 to 27 milliliters. At one week, the stomach holds 1.5 to 2 ounces per feeding. And by one month, your baby can take in 3 to 5 ounces in a single session.
This rapid growth explains why no single “ounces per day” number applies to newborns as a group. A two-day-old and a three-week-old have very different needs. Here’s how daily totals typically break down:
- Days 1 through 3: Intake varies widely and is measured in teaspoons rather than ounces. Colostrum or small amounts of formula are enough.
- Day 7: 10 to 20 ounces per 24 hours.
- Weeks 2 and 3: 15 to 25 ounces per 24 hours.
- One month and beyond: Formula-fed babies typically settle into 24 to 32 ounces per day.
Formula-Fed vs. Breastfed Babies
If your baby is formula-fed, the CDC recommends starting with 1 to 2 ounces of formula every 2 to 3 hours in the first days of life, then gradually increasing the amount per bottle as your baby’s stomach grows. By one month, most formula-fed infants are drinking 3 to 5 ounces per feeding and consuming around 24 to 32 ounces total per day.
Breastfed babies are harder to track by volume since milk goes directly from breast to baby. Instead of counting ounces, the key metric is feeding frequency: breastfed newborns eat about 8 to 12 times in 24 hours. Babies naturally regulate their intake at the breast, taking what they need and stopping when full. If you’re pumping and bottle-feeding breast milk, the daily ranges above (10 to 20 ounces at one week, 15 to 25 ounces by weeks two and three) give you a useful benchmark.
One nutritional note: babies who are exclusively breastfed, or who get less than 32 ounces of formula per day, need a vitamin D supplement starting shortly after birth. Formula is fortified with vitamin D, but breast milk alone doesn’t provide enough.
Feed on Demand, Not on a Schedule
The American Academy of Pediatrics advises parents to use their baby’s hunger and fullness cues rather than a strict volume target. Some babies are hungrier than others, and the same baby may eat different amounts at different feedings throughout the day. Rigid schedules or forcing a set number of ounces can lead to overfeeding or underfeeding.
Learning your baby’s hunger cues makes on-demand feeding easier. Early signs that a newborn is ready to eat include putting hands to their mouth, turning their head toward a breast or bottle, puckering or licking their lips, and clenching their fists. Crying is actually a late hunger signal. If you wait until your baby is wailing, they may be too worked up to latch or feed well, so watching for those quieter cues helps feedings go more smoothly.
How to Tell Your Baby Is Getting Enough
Since you can’t always measure what a breastfed baby drinks, diaper output is the most reliable everyday indicator. In the first two days, expect one or two bowel movements with dark, tarry stools. By days three and four, you should see at least two stools that shift from greenish to yellow. By five to seven days old, your baby should produce at least three to four yellow, loose stools per day and six or more wet diapers with pale or nearly colorless urine.
Weight gain is the other key marker. Newborns commonly lose a small percentage of their birth weight in the first few days, then gain it back within about two weeks. After that initial dip, healthy newborns gain roughly 1 ounce per day in the first few months, or about 5 to 7 ounces per week. Your pediatrician will track this at well-baby visits, but if you’re concerned between appointments, the diaper check gives you a daily read on whether feedings are on track.
Signs of Overfeeding and Underfeeding
Overfeeding happens more often with bottle-fed babies because the flow from a bottle is less work than nursing, making it easier to take in more than the stomach can handle. Common signs include frequent spitting up, loose or watery stools, and general fussiness after feedings. Occasional spit-up is normal in newborns, but if it happens after nearly every feeding alongside discomfort, your baby may be getting too much at once. Offering smaller amounts more frequently often solves the problem.
Underfeeding is typically caused by difficulty with sucking or swallowing, extreme fussiness that cuts feedings short, or not feeding often enough. A baby who consistently has fewer wet diapers than expected, isn’t regaining birth weight on schedule, or seems lethargic and unsatisfied after feedings may not be getting enough milk. Persistent underfeeding can lead to poor growth, so tracking those diaper counts and weight checks matters most in the early weeks when feeding patterns are still being established.
A Quick Reference by Week
- Days 1 to 3: A few teaspoons per feeding, 8 to 12 feedings per day. Total daily volume varies.
- Day 7: 1.5 to 2 ounces per feeding, 10 to 20 ounces per day.
- Weeks 2 to 3: About 2 to 3 ounces per feeding, 15 to 25 ounces per day.
- One month: 3 to 5 ounces per feeding, 24 to 32 ounces per day for formula-fed babies.
These ranges are guidelines, not rigid rules. A baby who consistently eats a little above or below these numbers but is gaining weight steadily, producing enough wet and dirty diapers, and seems content between feedings is almost certainly eating exactly the right amount.