A 1-week-old baby typically eats 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 most babies at this age land somewhere in the middle of that range. The exact amount depends on whether your baby is breastfed or formula-fed, how big they were at birth, and how quickly their stomach is growing.
What Your Baby’s Stomach Can Actually Hold
Your baby’s stomach is remarkably small at birth and grows rapidly over the first week. On day one, it holds only about 1 to 1.5 teaspoons per feeding (5 to 7 milliliters). By day three, capacity roughly quadruples to about 4.5 to 5.5 teaspoons. By day ten, the stomach can hold 2 to 2.75 ounces per feeding. So at exactly one week, your baby is somewhere between those last two milestones, likely able to take in about 1.5 to 2 ounces comfortably.
This is why tiny, frequent feedings are the norm. Your baby isn’t being difficult by wanting to eat every two hours. Their stomach simply can’t hold enough to go longer between meals yet.
Formula-Fed Babies
The CDC recommends starting with 1 to 2 ounces of formula every 2 to 3 hours in the first days of life. By one week, most formula-fed babies settle into a rhythm of about 2 ounces per feeding, 8 to 12 times a day. Formula takes longer to digest than breast milk, so your baby may stretch closer to 3 hours between feedings rather than 2.
You can gradually increase the amount per bottle as your baby shows signs of still being hungry after finishing. If your baby consistently drains a 2-ounce bottle and still roots around or sucks on their hands, try offering 2.5 ounces at the next feeding. Let your baby set the pace rather than trying to hit a fixed number.
Breastfed Babies
With breastfeeding, you can’t measure ounces directly, which is part of what makes this stage stressful for many parents. Breastfed newborns eat 8 to 12 times in 24 hours, sometimes as often as every 1 to 3 hours. Breast milk digests faster than formula, so breastfed babies tend to feed more frequently.
Rather than tracking volume, the best way to gauge intake is by watching your baby’s output and weight gain (more on both below). A feeding session might last 10 to 20 minutes per breast, though this varies widely. What matters is that your baby is latching well, you can hear swallowing, and they seem satisfied when they finish.
Cluster Feeding Is Normal at This Age
During the first week, your baby may cluster feed, meaning they have several short feedings bunched together, sometimes every hour, rather than spacing meals evenly. This can feel relentless, but it’s a normal pattern that helps stimulate milk production in breastfeeding parents and meets the caloric needs of a rapidly growing newborn.
Cluster feeding typically starts at birth and eases up by the end of the first week as your baby’s stomach grows and, if you’re breastfeeding, your milk supply becomes more established. If your baby is older than one week and still cluster feeding around the clock, that’s worth bringing up with your pediatrician. It could signal they’re not getting enough milk at each feeding.
How to Tell Your Baby Is Hungry
Crying is actually a late hunger signal, a sign of distress rather than the first indication your baby wants to eat. Earlier cues to watch for include fists moving toward the mouth, head turning as if looking for the breast, lip smacking or sucking on hands, and becoming more alert and active. Feeding your baby when you notice these early signals is easier on both of you, since a calm baby latches and feeds more effectively than one who’s already upset.
When your baby is full, you’ll see the opposite: they release the breast or slow down on the bottle, turn their head away, and visibly relax their body with open fists. Don’t push your baby to finish a bottle if they’re showing these signs. Overfeeding can cause discomfort and spit-up.
Weight Loss and Gain in the First Week
Nearly all newborns lose weight in the first few days after birth. A loss of up to 7% of birth weight is considered normal for full-term infants. For a baby born at 7.5 pounds, that’s about half a pound. Most babies stop losing weight around day three or four and regain their birth weight by day 10.
Your pediatrician will check your baby’s weight at their first visit, which usually happens within a few days of leaving the hospital. If your baby has lost more than 7 to 10% of birth weight, or isn’t trending back up by the end of the first week, your doctor may recommend supplementing feedings or adjusting your approach.
Diaper Count as a Feeding Gauge
The most reliable day-to-day way to confirm your baby is eating enough is by counting diapers. After day five, a well-fed newborn produces at least 6 wet diapers in 24 hours. The number of dirty diapers varies more, but you should be seeing some each day. In the early days, you can expect the numbers to climb gradually: one wet diaper on day one, two on day two, and so on, reaching that baseline of six or more by the end of the first week.
If your baby is consistently falling short of six wet diapers a day, or if the urine looks dark yellow or has a pinkish tint after the first few days, that can indicate they’re not taking in enough fluid.
Signs Your Baby Isn’t Getting Enough
Some degree of sleepiness is normal in a newborn, but a baby who is unusually drowsy, hard to wake for feedings, or increasingly irritable may not be getting adequate nutrition. Other signs of dehydration in a newborn include a sunken soft spot on top of the head, sunken eyes, few or no tears when crying, and fewer wet diapers than expected.
If your baby shows any of these signs, contact your pediatrician promptly. Dehydration in a newborn can escalate quickly because of their small body size and limited reserves. Cold or blotchy skin, rapid breathing, or extreme difficulty waking your baby are more serious signs that need immediate medical attention.