Most newborns eat 1 to 2 ounces per feeding in the first few days of life, gradually increasing to 2 to 3 ounces by the end of the second week. But those numbers only tell part of the story, because a newborn’s stomach grows rapidly in the first ten days, and how much your baby needs depends on their age in days, whether they’re breastfed or formula-fed, and their own hunger signals.
Your Newborn’s Stomach Is Tiny at First
On day one, a newborn’s stomach holds only about 5 to 7 milliliters per feeding, roughly 1 to 1.5 teaspoons. That’s smaller than a marble. By day three, capacity increases to about 22 to 27 milliliters (around 4.5 to 5.5 teaspoons). By day ten, the stomach can hold 2 to 2.75 ounces per feeding. This rapid expansion slows down after the first week and a half, eventually reaching about 4 ounces per feeding around three to four months old.
This is why tiny, frequent meals are normal in the beginning. Your baby isn’t being difficult by wanting to eat every two hours. Their stomach physically cannot hold more than a small amount at a time.
How Much to Expect, Day by Day
If your baby is breastfed, the volumes per feeding look like this during the first weeks:
- First 24 hours: 2 to 10 milliliters per feed (less than half an ounce)
- 24 to 48 hours: 5 to 15 milliliters per feed
- Day 3: About 1 ounce per feed
- Day 7: 1 to 2 ounces per feed, totaling 10 to 20 ounces over 24 hours
- Weeks 2 and 3: 2 to 3 ounces per feed, totaling 15 to 25 ounces per day
- 1 to 6 months: 3 to 4 ounces per feed, totaling 24 to 30 ounces per day
For formula-fed babies, the CDC recommends starting with 1 to 2 ounces every 2 to 3 hours in the first days. From there, you increase based on hunger cues, following roughly the same trajectory as the numbers above.
Breastfed vs. Formula-Fed Frequency
Breastfed newborns typically eat more often than formula-fed babies. Breast milk digests faster, so breastfed infants usually feed 8 to 12 times in 24 hours during the first couple of months. Formula-fed newborns eat slightly less frequently, around 6 to 10 times per day, because formula takes longer to digest and keeps them feeling full a bit longer.
If you’re breastfeeding, you won’t know the exact ounce count at each feeding, and that’s fine. Your baby regulates their own intake at the breast. What matters more is watching for signs that they’re getting enough, which comes down to diapers and weight gain (more on that below).
How to Read Your Baby’s Hunger Cues
Rather than feeding on a rigid clock, watch your baby. Early hunger signals include fists moving toward the mouth, head turning as if looking for the breast, lip smacking, and sucking on hands. These are your green light to start a feeding.
Crying is actually a late hunger cue, a sign of distress rather than the first signal. A baby who’s already crying can have a harder time latching and settling into a feeding. If you catch the earlier signs, feedings tend to go more smoothly.
When your baby is full, you’ll notice them release the breast or bottle nipple, turn their head away, relax their body, and open their fists. Trying to push more milk after these signals can lead to overfeeding, especially with bottles, where the flow is harder for the baby to control.
Growth Spurts Change the Pattern
Just when you think you’ve figured out your baby’s schedule, a growth spurt will throw it off. These typically happen around 2 to 3 weeks, 6 weeks, 3 months, and 6 months. During a spurt, your baby may want to nurse or take a bottle much more often, sometimes as frequently as every 30 minutes. They’ll likely be fussier than usual and seem hungry right after a full feeding.
This is normal and temporary, usually lasting a few days. For breastfeeding parents, the increased demand signals your body to produce more milk. For formula-feeding parents, it means offering an extra ounce or an additional feeding when your baby shows hunger cues. You’re not doing anything wrong. Your baby just needs more fuel for a short stretch.
Signs Your Baby Is Getting Enough
Since you can’t measure what a breastfed baby drinks, and even bottle-fed babies vary from feeding to feeding, the most reliable way to track adequate intake is through diapers and weight. After day five, your newborn should produce at least 6 wet diapers per day. Fewer than that can signal dehydration.
Weight is the strongest indicator overall. Babies lose some weight in the first few days of life, which is completely expected. By about two weeks old, they should be back to their birth weight. After that, healthy newborns gain roughly 1 ounce (28 grams) per day during the first few months. Your pediatrician will track this at well-child visits.
Warning Signs of Underfeeding or Dehydration
A few physical signs suggest your baby isn’t getting enough milk or formula. A dry, sticky mouth (instead of the wet, drooly mouth of a well-hydrated baby) is one of the earliest red flags. A sunken soft spot on the top of the head is another sign that warrants prompt attention. Babies older than about 4 months should produce tears when they cry; the absence of tears at that age can point to dehydration.
Persistent sleepiness where your baby is difficult to wake for feedings, combined with fewer wet diapers than expected, is a pattern worth taking seriously. If your baby isn’t back to birth weight by two weeks, or if you notice any of these signs, a visit with your pediatrician or a lactation consultant can help identify whether there’s a feeding issue and how to correct it.