A one-week-old baby eats about 1 to 2 ounces (30 to 60 ml) per feeding, whether breastfed or formula-fed. At this age, your baby’s stomach is roughly the size of an apricot and can hold 45 to 60 ml at a time, so feedings are small but frequent.
How Much Per Feeding
Your baby’s stomach has grown rapidly since birth but is still tiny. In the first day or two of life, a newborn takes in only 2 to 10 ml per feeding. By day three, that triples to about 1 ounce. By the end of the first week, most babies are comfortable taking 1 to 2 ounces per feeding. That range holds for both breast milk and formula.
If you’re breastfeeding, you won’t be able to measure exact ounces, and that’s fine. Your baby regulates their own intake at the breast, taking what they need and stopping when full. The better indicators of adequate intake are your baby’s behavior, weight gain, and diaper output (more on those below).
How Often to Feed
Breastfed newborns typically eat 8 to 12 times in a 24-hour period. That works out to roughly every 2 to 3 hours, though feedings won’t be evenly spaced. Some sessions will be long, others surprisingly short. Both are normal. Babies take what they need at each feeding and stop when they’re satisfied.
Formula-fed babies tend to fall into a slightly more predictable rhythm, feeding every 3 to 4 hours. The American Academy of Pediatrics recommends feeding formula-fed newborns on demand in those early weeks rather than sticking to a rigid clock. If your baby shows hunger cues, offer a bottle regardless of when the last one was.
Why Cluster Feeding Happens
You may notice your baby wanting to eat every 30 to 60 minutes during certain stretches, particularly in the evening. This is cluster feeding, and it’s common in the first week. It happens for a few overlapping reasons: your baby’s stomach is still so small it empties quickly, the hormone that drives milk production (prolactin) naturally dips later in the day which can slightly reduce your supply per feeding, and your baby may simply need comfort or extra calories during a growth spurt.
Cluster feeding can feel relentless, but it typically settles down. By the end of the first week, most babies stop cluster feeding around the clock. If your baby seems to want to nurse nonstop with no relief at all, it’s worth checking in with your pediatrician or a lactation consultant to make sure the latch is effective and your baby is transferring milk well.
Hunger and Fullness Cues to Watch For
Rather than watching the clock, let your baby tell you when they’re hungry and when they’ve had enough. Hunger cues in the first week include putting hands to their mouth, turning their head toward your breast or the bottle (called rooting), puckering or smacking their lips, and clenching their fists. Crying is a late hunger signal. Ideally, you’ll catch the earlier signs and offer a feed before your baby gets too upset to latch well.
When your baby is full, they’ll close their mouth, turn their head away from the breast or bottle, and visibly relax their hands. These signs are reliable. Resist the urge to coax your baby into finishing a bottle if they’re turning away.
Weight Changes in the First Week
Almost all newborns lose weight in the first few days after birth. A loss of 7 to 10 percent of birth weight is average and expected. So an 8-pound baby might drop to about 7 pounds 3 ounces before things turn around. This initial dip reflects fluid loss, not inadequate feeding.
The key milestone is regaining birth weight by 10 to 14 days of age. Your pediatrician will weigh your baby at the first office visit (usually 3 to 5 days after birth) to make sure the loss is within a normal range and that weight is starting to trend upward. If your baby hasn’t returned to birth weight by two weeks, that’s a signal to evaluate feeding more closely.
Diaper Output as a Feeding Gauge
Counting diapers is the most practical way to know your baby is getting enough milk. After day five, you should see at least 6 wet diapers in a 24-hour period. The number of dirty diapers varies more, especially between breastfed and formula-fed babies, but you should be seeing some stool each day in the first week.
Wet diapers can be hard to judge with modern absorbent materials. If you’re unsure whether a diaper is wet, pour 2 to 3 tablespoons of water onto a clean diaper to learn what “wet” actually feels like. That gives you a reference point.
Signs Your Baby Isn’t Getting Enough
Dehydration in a one-week-old is serious and worth knowing how to spot. Warning signs include a sunken soft spot on top of the head, sunken eyes, few or no tears when crying, fewer wet diapers than expected, and unusual drowsiness or irritability. If your baby is consistently hard to wake for feedings, seems too sleepy to eat, or you’re seeing fewer than 6 wet diapers a day after day five, contact your pediatrician promptly.
Other red flags include your baby losing more than 10 percent of birth weight, not showing any weight gain by the end of the first week, or feeding sessions that are consistently shorter than 5 minutes on the breast (which can suggest a weak latch or low milk transfer). None of these necessarily mean something is wrong, but they all warrant a professional check.