A one-week-old baby typically drinks 1 to 2 ounces per feeding, with 8 to 12 feedings spread across a 24-hour period. That works out to roughly 12 to 24 ounces total per day, though the exact amount varies based on your baby’s size, whether they’re breastfed or formula-fed, and how hungry they are at any given moment.
These numbers can feel surprisingly small, but they match what a newborn’s body is designed to handle. Understanding how your baby’s stomach grows during this first week helps the ounce ranges make a lot more sense.
Why the Amount Is So Small
A one-week-old baby’s stomach is about the size of an apricot, holding roughly 1.5 to 2 ounces at a time. That’s a dramatic change from birth, when the stomach was closer to the size of a cherry and could only hold about a teaspoon of milk per feeding. Within the first 24 hours of life, most babies take in just 2 to 10 milliliters per feeding. By day three, that triples to about 1 ounce. By the end of the first week, feedings settle into the 1 to 2 ounce range.
This rapid progression means your baby’s intake changes noticeably from one day to the next. A feeding that seemed adequate on day two will feel too small by day five, and that’s completely normal.
Breastfed vs. Formula-Fed Schedules
Breastfed newborns tend to eat more frequently than formula-fed babies because breast milk digests faster. In the first week and beyond, breastfed babies typically nurse every 2 to 3 hours, totaling 8 to 12 sessions in 24 hours. By day four or five, you should be nursing at roughly that pace.
Formula-fed babies eat slightly less often, usually 6 to 10 times in a 24-hour period. The CDC recommends starting with 1 to 2 ounces of formula every 2 to 3 hours in the first days of life, then offering more if your baby still seems hungry.
With breastfeeding, you can’t measure ounces directly, which is why other signals (like diaper counts and weight gain) become so important for tracking whether your baby is getting enough.
How to Tell Your Baby Is Hungry
Rather than watching the clock, the most reliable approach is feeding on demand by watching your baby’s hunger cues. Early signs of hunger include fists moving toward the mouth, head turning as if looking for the breast, becoming more alert and active, sucking on hands, lip smacking, and opening and closing the mouth.
Crying is actually a late hunger cue. By the time a baby is crying from hunger, they’re often too upset to latch or feed well. Catching those earlier, subtler signals makes feedings go more smoothly for both of you.
Signs Your Baby Has Had Enough
Fullness cues are just as important as hunger cues. Your baby is done eating when they release or fall off the breast, turn away from the nipple, relax their body, or open their fists. If you’re bottle-feeding, you might also notice your baby slowing down their sucking, losing interest in the bottle, or falling asleep.
Resist the urge to push the last half-ounce of a bottle. A one-week-old’s stomach is tiny, and overfeeding can cause discomfort, spitting up, and fussiness. If your baby signals they’re full after just an ounce, that’s fine. They’ll make up for it at the next feeding.
Cluster Feeding in the First Week
Don’t be alarmed if your baby suddenly wants to eat every 30 to 60 minutes for several hours in a row. This is called cluster feeding, and it’s common in the first week of life. Some researchers believe it coincides with growth spurts, though the evidence isn’t conclusive.
Cluster feeding is normal in short bursts, but it shouldn’t last all day, every day beyond the first week. If your baby seems to need constant feeding around the clock after day seven, it could signal a latch issue or a temporary dip in milk supply. More frequent feeds at that stage sometimes mean the baby isn’t getting enough at each session.
Tracking Whether Your Baby Gets Enough
The best day-to-day indicator of adequate intake is diaper output. After day five, your baby should produce at least 6 wet diapers in 24 hours. The number of dirty diapers varies more, but you should be seeing some each day during the first week.
Weight is the other key measure. Most newborns lose a small percentage of their birth weight in the first day or two, with the lowest point typically around 28 hours after delivery. On average, babies lose about 4 to 5 percent of their birth weight before they start gaining it back. Boys tend to start regaining weight around 105 hours (about 4.5 days), while girls take slightly longer at around 114 hours (just under 5 days). Your pediatrician will check weight at early visits specifically to confirm this recovery is on track.
A weight loss greater than 7 to 10 percent of birth weight, or a baby who hasn’t started regaining by the end of the first week, is worth discussing with your pediatrician promptly.
How Intake Changes After Week One
The 1 to 2 ounce range doesn’t last long. As your baby’s stomach grows, feeding volumes increase steadily. By two weeks, many babies are taking 2 to 3 ounces per feeding. By one month, 3 to 4 ounces is typical. The number of feedings per day gradually decreases as the volume per feeding goes up, so the total daily intake climbs without your baby needing to eat every hour.
The first week is really about establishing a rhythm. Your baby is learning to coordinate sucking, swallowing, and breathing. You’re learning their cues. The ounces will take care of themselves as long as you’re feeding responsively and keeping an eye on those wet diapers.