A newborn’s stomach holds only about 1 to 1.5 teaspoons (5 to 7 ml) on the first day of life, so feedings start remarkably small and increase quickly. Whether you’re breastfeeding or formula feeding, most newborns eat 8 to 12 times in 24 hours during the early weeks. The exact amount per feeding depends on your baby’s age in days, their weight, and whether they’re getting breast milk or formula.
Stomach Size in the First 10 Days
Your baby’s stomach grows fast, and understanding its size helps explain why newborns eat so little at first but need to eat so often. On day one, the stomach holds roughly 5 to 7 ml, about the size of a cherry. By day three, it expands to around 22 to 27 ml (about 4.5 to 5.5 teaspoons), closer to the size of a walnut. By day 10, your baby can take in 60 to 81 ml per feeding, which is 2 to nearly 2.75 ounces.
This rapid growth is why feeding amounts change noticeably from one day to the next. A baby who seemed satisfied with a few drops of colostrum on day one will want noticeably more by the end of the first week.
Formula Feeding Amounts
If your baby is exclusively formula fed, start by offering 1 to 2 ounces every 2 to 3 hours in the first days. Most formula-fed newborns eat 8 to 12 times in a 24-hour period during this stage. That works out to roughly 12 to 24 ounces total per day in the first week, though the range varies from baby to baby.
Over the first few weeks and months, the time between feedings stretches out. Most formula-fed babies settle into a pattern of eating every 3 to 4 hours. By around one month, many babies take 3 to 4 ounces per feeding. The CDC notes that babies receiving about 32 ounces or more of formula per day get enough vitamin D from the formula itself and don’t need a separate supplement.
Let your baby set the pace. Offer the bottle, watch for signs they’re done, and resist the urge to push them to finish a specific amount. Babies are generally reliable at regulating their own intake when you follow their cues.
Breastfeeding Frequency and Duration
With breastfeeding, you can’t measure ounces directly, so frequency and feeding behavior become your guide. Newborns typically breastfeed 8 to 12 times in 24 hours. In the first few days, each session may last 10 to 20 minutes per breast, though some babies are faster and others take longer.
Breast milk production works on supply and demand. The more often your baby feeds, the more milk your body makes. This is why frequent feeding in the early days is both normal and important for establishing your supply. Colostrum, the thick first milk, comes in small volumes that match a newborn’s tiny stomach perfectly.
Cluster Feeding
Don’t be alarmed if your baby suddenly wants to eat every 30 to 60 minutes for several hours, especially in the evening. This is cluster feeding, and it’s a normal pattern where babies have several short feeds spaced much closer together than usual.
There are a few reasons this happens. Prolactin, the hormone that drives milk production, tends to dip later in the day, which can slightly reduce milk supply in the evening. Your baby compensates by feeding more frequently. Cluster feeding also happens during growth spurts and developmental leaps, and sometimes babies simply want the comfort of being close to you. It doesn’t mean your milk supply is inadequate.
How to Tell Your Baby Is Hungry
Crying is actually a late sign of hunger, not an early one. Once a baby is crying from hunger, latching becomes harder and feeding can be more stressful for both of you. Learning the earlier signals helps you catch hunger before it escalates.
Early hunger cues include fists moving toward the mouth, head turning as if searching for a breast or bottle, lip smacking or licking, clenched hands, and becoming more alert and active. When you notice these behaviors, it’s time to offer a feeding right away rather than waiting for a scheduled time.
How to Tell Your Baby Is Full
Fullness signals are subtler but equally important. A satisfied baby will typically relax their hands (unclenching fists), turn away from the breast or bottle, slow down their sucking, or fall asleep. Some babies will push the nipple out with their tongue or simply lose interest.
Forcing a baby to finish a bottle after they show these signs can override their natural ability to self-regulate intake. If your baby stops eating, trust that they’ve had enough for that feeding. They’ll let you know when they’re ready for the next one.
Tracking Intake With Diapers
Since you can’t measure how much a breastfed baby takes in, wet and dirty diapers are the most practical way to confirm your baby is eating enough. In the first few days, expect the number of wet diapers to roughly match your baby’s age in days: one on day one, two on day two, and so on. After day five, your newborn should produce at least six wet diapers every 24 hours. The number of dirty diapers will vary more, but frequent stooling in the first weeks is a good sign of adequate intake.
Normal Weight Loss and Recovery
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 babies. So a baby born at 8 pounds might drop to about 7 pounds 7 ounces before turning the corner. Most babies regain their birth weight by day 10.
A weight loss reaching 10% of birth weight warrants closer attention from your pediatrician, as it can signal feeding difficulties or other issues that need to be addressed. Your baby will be weighed at their first few checkups specifically to track this recovery.
Waking a Sleeping Newborn to Feed
In the early days, some newborns are sleepy enough to snooze through feeding times. Until your baby has established a pattern of steady weight gain and returned to birth weight, you should wake them to feed if three hours have passed since the last feeding (or two hours for very small or premature babies). This protects against dehydration and helps establish milk supply if you’re breastfeeding.
Once your baby has hit the birth-weight milestone and is gaining well, it’s generally fine to let them sleep and wait until they wake on their own to feed.
Vitamin D for Breastfed Babies
Breast milk provides nearly everything a newborn needs, with one notable exception: vitamin D. The American Academy of Pediatrics recommends that breastfed and partially breastfed infants receive 400 IU of vitamin D per day, starting in the first few days of life. Liquid vitamin D drops designed for infants are available over the counter, and a single drop is all it takes. Formula-fed babies who drink at least 32 ounces of formula daily get enough vitamin D from the formula and don’t need the supplement.