A newborn drinks surprisingly little at first. On day one, a baby’s stomach holds just 5 to 7 milliliters (about a teaspoon) per feeding, so those early meals are tiny by design. By the end of the first month, that amount climbs to 3 to 5 ounces per feeding. How quickly intake increases depends on whether you’re breastfeeding, formula feeding, or doing a combination of both.
Your Baby’s Stomach in the First Days
Newborn stomachs are remarkably small, and they grow fast. On day one, the stomach holds roughly 5 to 7 milliliters, about the size of a cherry. By day three, capacity jumps to 22 to 27 milliliters, closer to the size of a walnut. This rapid expansion is why feeding amounts change noticeably even within the first week.
Because the stomach is so small at birth, newborns need to eat frequently but in very small volumes. This is completely normal. Colostrum, the thick first milk produced before mature breast milk comes in, is concentrated enough that even a teaspoon delivers meaningful nutrition and immune protection. If you’re formula feeding, your baby will similarly take only about 1 to 2 ounces per feeding in those early days.
Breastfeeding Amounts and Frequency
Breastfed newborns typically eat 8 to 12 times in a 24-hour period. That works out to roughly every two to three hours, though the spacing won’t be perfectly even. Some feedings will cluster close together, especially in the evening, and that’s normal.
With breastfeeding, you can’t measure exact ounces going in, which is one of the most common sources of anxiety for new parents. Instead of volume, you track feeding behavior: your baby latches well, you can hear or see swallowing, and feedings last anywhere from 10 to 20 minutes per breast (though this varies widely). By one month, most breastfed babies take somewhere between 80 and 150 milliliters (3 to 5 ounces) per feeding session.
Formula Feeding Amounts Week by Week
Formula feeding offers the advantage of visible measurements. Here’s what to expect:
- First week: 1 to 2 ounces (30 to 60 ml) per feeding, offered every 2 to 3 hours.
- Weeks two through four: Amounts gradually increase as your baby’s stomach grows. Most babies work up to 3 to 4 ounces (90 to 120 ml) per feeding.
- End of the first month: A typical baby takes 3 to 4 ounces per feeding every 3 to 4 hours, totaling around 32 ounces over a full day.
These are averages. Some babies consistently drink a little less per feeding but eat more frequently, while others space feedings further apart and take more at each one. Both patterns are fine as long as your baby is gaining weight and producing enough wet and dirty diapers.
How to Tell Your Baby Is Getting Enough
Since you can’t peek inside a baby’s stomach, diaper output is the most reliable day-to-day indicator. In the first few days, expect roughly one wet diaper and one dirty diaper for each day of life: one of each on day one, two of each on day two, and so on. After day four, stools should turn yellow, and your baby should produce at least three to four stools daily, each about the size of a quarter or larger. Once breast milk fully comes in (usually by day three or four), expect five to six or more wet diapers every 24 hours.
Weight gain is the other key measure. Babies commonly lose up to 7 to 10 percent of their birth weight in the first few days, then start regaining. After that initial dip, healthy newborns gain about half a pound per week. Your pediatrician will track weight at each visit, so you don’t need a home scale to stay on top of this.
Reading Your Baby’s Hunger and Fullness Cues
Crying is actually a late hunger signal. Well before crying, a hungry newborn will bring hands to mouth, turn their head toward your breast or a bottle (called rooting), pucker or smack their lips, and clench their fists. Catching these early cues makes feeding easier because a calm baby latches and feeds more effectively than a worked-up, crying one.
When your baby is full, the signals are equally clear: they’ll close their mouth, turn their head away from the breast or bottle, and relax their hands. Trying to push more milk after these cues appear can lead to spit-up and discomfort. Let your baby set the pace rather than aiming for a specific number of ounces every time.
Growth Spurts and Temporary Increases
Around 2 to 3 weeks of age, most babies hit their first growth spurt. Another common one follows around 6 weeks. During these bursts, your baby may want to feed much more frequently, sometimes as often as every 30 minutes, and may seem fussier than usual between feedings. This can feel alarming, especially for breastfeeding parents who worry their supply has dropped.
Growth spurts typically last only a few days. For breastfed babies, the increased nursing actually serves a purpose: it signals your body to produce more milk to match your baby’s growing needs. For formula-fed babies, you may notice they drain bottles faster and seem hungry sooner than their usual schedule. Offering an extra ounce or an additional feeding during these stretches is a reasonable response. Things generally settle back to a more predictable rhythm within two to three days.
Signs Something May Be Off
A few red flags suggest a baby isn’t getting enough milk. Fewer wet diapers than expected for their age, dark or concentrated urine after the first few days, persistent weight loss beyond the first week, or extreme sleepiness that makes it hard to wake your baby for feedings all warrant attention. On the other end, frequent forceful vomiting (not just spit-up) after most feedings could signal overfeeding or another issue worth investigating.
Every baby’s appetite varies from feeding to feeding and day to day. The numbers above are guidelines, not rigid targets. A baby who consistently falls within the general range, gains weight steadily, and produces plenty of wet and dirty diapers is almost certainly getting exactly what they need.