A newborn needs surprisingly little milk at first, starting with just 1 to 2 teaspoons per feeding on day one and gradually increasing to about 2 ounces per feeding by day 10. Whether you’re breastfeeding or formula feeding, the pattern is the same: small, frequent meals that grow alongside your baby’s stomach.
Your Newborn’s Stomach Is Tiny
At birth, a baby’s stomach is roughly the size of a marble, holding only 1 to 2 teaspoons of milk. This is why newborns eat so often and take so little at each feeding. By day 10, the stomach has grown to about the size of a ping-pong ball, holding around 2 ounces. That rapid growth means feeding volumes change noticeably from one week to the next, so what looks like “not enough” on day two is perfectly normal for a stomach that small.
Feeding Amounts in the First Weeks
For 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. That works out to 8 to 12 feedings in a 24-hour period. Over the first few weeks, the time between feedings stretches to every 3 to 4 hours as your baby takes more at each session.
Breastfed babies also eat 8 to 12 times in 24 hours, typically every 2 to 4 hours. Because breast milk digests faster than formula, breastfed newborns sometimes feed on the higher end of that range. You can’t measure ounces at the breast the way you can with a bottle, which is why other indicators (diapers, weight, and your baby’s behavior) become the best way to gauge whether intake is on track.
Cluster Feeding Is Normal
Cluster feeding is when your baby has several short feeds spaced much closer together than usual, sometimes every hour instead of every two to three. It starts the day your baby is born and is completely expected. In those first days, near-constant feeding helps stimulate milk production and gives your baby enough nourishment while their stomach is still marble-sized. By the end of the first week, round-the-clock cluster feeding typically settles down.
In older newborns, cluster feeding often shows up in the evenings. Milk supply tends to dip slightly at that time of day because the hormone that drives milk production naturally drops in the evening hours. Your baby compensates by feeding more frequently to get the same total volume. This doesn’t mean your supply is failing. It’s a built-in feedback loop that works itself out.
How to Tell Your Baby Is Getting Enough
Since you can’t always measure what a breastfed baby takes in, diapers and weight are the most reliable checkpoints.
- Wet diapers: After day 5, expect at least 6 wet diapers per day. Fewer than that can signal low intake.
- Weight loss: Newborns normally lose up to 7% of their birth weight in the first few days. They should regain it by around day 10. A loss of 10% or more warrants closer attention from your pediatrician.
- Stool patterns: The number of dirty diapers varies after the first week, but in the early days, regular stools that transition from dark meconium to yellow and seedy (in breastfed babies) are a good sign.
Recognizing Hunger and Fullness Cues
Crying is actually a late sign of hunger. Well before that point, your baby will show subtler signals: bringing hands to their mouth, turning their head toward your breast or a bottle, puckering or smacking their lips, or clenching their fists. Feeding at these early cues makes latching easier and keeps your baby calmer during the feeding.
When your baby is full, they’ll typically slow their sucking, turn away from the breast or bottle, relax their hands, or fall asleep. Following these cues rather than pushing to finish a set amount helps prevent overfeeding, which is more common with bottle feeding. A baby who consistently drinks more than their stomach can comfortably hold may spit up frequently or seem restless and uncomfortable after feeds. If that’s happening, offering slightly less milk more often can help.
Breastfed Babies and Vitamin D
Breast milk provides nearly everything a newborn needs, with one exception: vitamin D. The CDC recommends that babies who are exclusively or partially breastfed receive 400 IU of vitamin D daily, starting shortly after birth. Formula-fed babies get vitamin D through the formula itself, so supplementation is only necessary if they’re also receiving breast milk. Liquid vitamin D drops designed for infants are available over the counter and are given as a single daily drop.