A newborn drinks surprisingly little at first, starting with just 1 to 2 teaspoons per feeding on day one and gradually working up to about 2 ounces per feeding by day ten. By one month, most babies take 3 to 4 ounces per session. These amounts increase steadily as your baby’s stomach grows, but the exact volume depends on your baby’s age, weight, and whether they’re breastfed or formula-fed.
The First Few Days: Smaller Than You Think
At birth, your baby’s stomach is roughly the size of a toy marble, holding only about 1 to 2 teaspoons (5 to 7 milliliters). This is why first feedings are tiny. In the first 24 hours, babies typically take in 2 to 10 milliliters per feed, which is less than half an ounce. By the second day, that increases slightly to 5 to 15 milliliters as the stomach stretches to hold 22 to 27 milliliters.
These small volumes are completely normal and by design. Colostrum, the thick early breast milk, is nutrient-dense enough to sustain a newborn in very small quantities. Formula-fed newborns start with similarly small amounts. By day ten, your baby’s stomach has grown to roughly the size of a ping-pong ball, holding about 2 ounces (60 milliliters) per feeding.
Week by Week: How Volumes Increase
After the first week, feeding volumes climb quickly. Here’s what to expect as your baby grows through the first few months:
- Week one: 1 to 2 ounces per feeding, 8 to 12 feedings per day
- Weeks two to four: 2 to 3 ounces per feeding
- One to two months: 3 to 4 ounces per feeding
- Two to four months: 4 to 6 ounces per feeding
These are averages. Some feedings will be bigger, others smaller. Babies don’t eat the same amount every time, just like adults don’t.
A Simple Formula for Daily Intake
If you want a more personalized number, there’s a straightforward calculation. Babies need roughly 2.5 ounces of formula per pound of body weight per day. So an 8-pound baby would need about 20 ounces total across a full day. Divide that by the number of feedings (typically 8 to 12 for a newborn), and you get roughly 2 to 2.5 ounces per session.
This calculation works well for formula-fed babies. Breastfed babies regulate their own intake more naturally at the breast, so measuring exact ounces is less practical and less necessary. If you’re pumping and bottle-feeding breast milk, the same general ranges apply.
Breastfed vs. Formula-Fed Intake
Breastfed and formula-fed newborns actually consume remarkably similar volumes in the early days. A study of over 200 six-day-old infants found that bottle-fed babies took an average of 67 milliliters (about 2.3 ounces) per feed, while breastfed babies took about 75 milliliters (2.5 ounces). Both groups spent around 25 minutes feeding.
The bigger difference is in feeding patterns. Breastfed babies tend to eat more frequently because breast milk digests faster than formula. They may feed every 1 to 3 hours in the early weeks, sometimes clustering several feedings close together. Formula-fed babies often go slightly longer between feeds, typically every 2 to 4 hours, because formula takes more time to break down.
Over the first few weeks and months, the gaps between feedings gradually stretch. Most breastfed babies settle into a pattern of eating every 2 to 4 hours, with occasional longer sleep stretches of 4 to 5 hours.
How to Tell Your Baby Is Getting Enough
Ounce guidelines are helpful, but your baby’s behavior and diaper output are more reliable indicators than hitting an exact number. Hunger cues to watch for include hands moving to the mouth, turning toward the breast or bottle, lip smacking, and clenched fists. Crying is actually a late hunger sign, so try to catch the earlier cues when possible.
When your baby is full, you’ll notice them closing their mouth, turning their head away from the breast or bottle, and relaxing their hands. These signals are your best guide for when to stop a feeding.
Diaper counts offer a practical daily check. After day five, a well-fed newborn produces at least six wet diapers per day. Fewer than that can signal insufficient intake and is worth mentioning to your pediatrician. Steady weight gain, tracked at regular checkups, is the gold standard for confirming your baby is eating enough.
Signs of Overfeeding
Overfeeding is more common with bottle feeding than breastfeeding, because milk flows from a bottle even when a baby is sucking for comfort rather than hunger. When a baby takes in more than their stomach can handle, they can’t digest it properly. The result is often excessive spit-up, gassiness, belly discomfort, loose stools, and more crying than usual. Babies also swallow more air when they’re overfed, which compounds the discomfort.
If your baby consistently seems uncomfortable after feedings, try offering smaller amounts more frequently rather than larger bottles spaced further apart. Paced bottle feeding, where you hold the bottle more horizontally and let the baby control the flow, can also help prevent them from taking in more than they need.
Feeding Frequency Matters as Much as Volume
Newborns eat 8 to 12 times in a 24-hour period during the first weeks. That’s roughly every 2 to 3 hours around the clock. This frequency isn’t just about calories. Frequent feeding helps establish milk supply for breastfeeding mothers and keeps your baby’s blood sugar stable.
On-demand feeding, meaning you feed whenever your baby shows hunger cues rather than on a rigid schedule, is recommended over timed feedings. Some days your baby will eat more often, especially during growth spurts, which commonly happen around 2 weeks, 3 weeks, and 6 weeks. During these periods, a breastfed baby may want to nurse every hour for a stretch. This cluster feeding is normal and temporary, usually lasting a day or two before spacing out again.