Most newborns eat 1 to 2 ounces per feeding in the first few days of life, gradually increasing to 3 to 5 ounces by the end of the first month. But the exact amount depends on your baby’s age in days, whether you’re breastfeeding or formula feeding, and your baby’s individual hunger cues. Here’s what to expect week by week.
Your Baby’s Stomach Is Tiny at First
A newborn’s stomach on day one holds only about 5 to 7 milliliters, roughly one teaspoon. That’s why those first feedings are so small and so frequent. By day three, stomach capacity jumps to around 22 to 27 milliliters. At one week, your baby can take in 1.5 to 2 ounces (45 to 60 ml) per feeding. And by one month, feedings typically land between 3 and 5 ounces.
This rapid growth in stomach size explains why feeding volumes change so quickly. You’re not doing anything wrong if your baby only takes a tiny amount in those first couple of days. Their body simply can’t hold more yet.
Formula Feeding Amounts by Age
If your baby is exclusively formula fed, the CDC recommends starting with 1 to 2 ounces every 2 to 3 hours in the first days of life. Most formula-fed newborns eat 8 to 12 times in a 24-hour period during this early stretch. That works out to feeding roughly every 2 to 3 hours around the clock, including overnight.
Over the first few weeks, your baby will take more at each feeding and go a bit longer between them. By about a month old, most formula-fed babies settle into a pattern of eating every 3 to 4 hours. A general upper benchmark: babies getting about 32 ounces or more of formula per day are meeting their nutritional needs fully, including vitamin D requirements.
Resist the urge to top off a bottle if your baby seems satisfied. Overfeeding formula is more common than underfeeding, and your baby’s hunger and fullness cues are the best guide to portion size.
Breastfeeding Frequency and Duration
Because you can’t measure ounces at the breast, breastfeeding relies more on frequency and your baby’s behavior. Breastfed newborns also eat 8 to 12 times in 24 hours. Some feeding sessions will be long, others surprisingly short. Both are normal.
The key difference from formula feeding is that breast milk digests faster, so breastfed babies sometimes feed more frequently. Rather than watching the clock, focus on offering the breast whenever your baby shows hunger cues. Frequent nursing in the early days also helps establish your milk supply, so those round-the-clock sessions serve a double purpose.
How to Read Hunger and Fullness Cues
Crying is actually a late sign of hunger. Well before that point, your baby will give you signals. Early hunger cues include putting hands to mouth, turning their head toward your breast or the bottle (called rooting), puckering or smacking their lips, and clenching their fists.
Fullness looks different. A satisfied baby will close their mouth, turn their head away from the breast or bottle, and relax their hands. If you notice your baby’s fists unclenching during a feeding, that’s a reliable sign they’re getting full. Letting your baby guide the feeding this way helps prevent both under and overfeeding.
Cluster Feeding and Growth Spurts
There will be stretches when your baby seems insatiable, wanting to eat every 30 minutes to an hour, especially in the evening. This is called cluster feeding, and it’s completely normal. It doesn’t mean your milk supply is low or that your baby isn’t getting enough.
Growth spurts amplify this pattern. They typically hit around 2 to 3 weeks, 6 weeks, 3 months, and 6 months of age. During a growth spurt, your baby may be fussier than usual and want to nurse or take a bottle much more often, sometimes as frequently as every 30 minutes. These intense periods usually last a few days and then ease up.
When to Wake a Sleeping Newborn
Most newborns lose some weight after birth, and about 80 percent regain it by two weeks of age. Until your baby has reached that birth-weight milestone, you should wake them for a feeding if it’s been more than four hours since the last one. This applies day and night.
Once your baby is consistently gaining weight and has passed their birth weight, it’s generally fine to let them sleep and wait for hunger cues. Your pediatrician will track weight at early checkups and let you know when you can stop setting those middle-of-the-night alarms.
Tracking Output Instead of Input
If you’re breastfeeding and can’t measure ounces, diaper counts are your best proxy for whether your baby is eating enough. After day five of life, expect at least six wet diapers per day. The number of dirty diapers varies more, but consistent wet diapers are the reliable marker.
In the first few days, output is lower because intake is lower. That’s normal. You’ll see the diaper count climb as your milk comes in or as formula volumes increase.
Signs Your Baby Isn’t Getting Enough
Weight loss of more than 10 percent of birth weight is a red flag that needs prompt evaluation. Most babies lose some weight in the first few days, but a loss beyond that threshold, or slow recovery back to birth weight, signals a feeding problem.
Dehydration is the more immediate concern. In a baby, signs include a sunken soft spot on the top of the head, sunken eyes, few or no tears when crying, very few wet diapers, and unusual drowsiness or irritability. Any of these warrants a same-day call to your pediatrician, particularly in the first two weeks when feeding patterns are still being established.