How Much Should a Newborn Eat? A Simple By-Age Guide

The short answer

In the first few days, a newborn eats very little at a time — often just half an ounce to 1 ounce (about 15–30 ml) per feeding — because their stomach starts out roughly the size of a marble. By the end of the first week, most babies take 1.5 to 3 ounces (45–90 ml) per feeding, and by about one month they're up to 3 to 4 ounces (90–120 ml).

The other half of the answer is how often: newborns feed 8 to 12 times in 24 hours, or roughly every 2 to 3 hours around the clock. If you're doing quick math and it feels like you're feeding constantly — you are. That's completely normal for a brand-new baby.

The single best way to know your baby is eating enough isn't the number of ounces. It's wet and dirty diapers plus weight gain, which we'll cover below.

How much should a newborn eat, by age

These are typical ranges for healthy, full-term babies. Every baby is a little different, so treat them as a starting point, not a target to hit exactly.

Days 1–3 (colostrum stage)

• Per feeding: ~0.5 oz (5–15 ml), building toward 1 oz
• How often: every 1–3 hours, 8–12 times a day
• Your baby's stomach is tiny, and breastfeeding parents are producing thick, concentrated colostrum in small amounts — which is exactly what a newborn needs. Small feeds are the design, not a problem.

Days 4–7

• Per feeding: ~1–2 oz (30–60 ml)
• How often: every 2–3 hours
• Milk "comes in" for breastfeeding parents around days 3–5, and intake climbs quickly. Expect a jump in wet diapers this week.

Weeks 2–4

• Per feeding: ~2–3 oz (60–90 ml)
• How often: every 2.5–3.5 hours, still 8–12 feeds a day
• Watch for a growth spurt around 2–3 weeks, when your baby may want to feed almost nonstop for a day or two.

1–2 months

• Per feeding: ~3–4 oz (90–120 ml)
• How often: every 3–4 hours
• Feeds get bigger and slightly less frequent. Another growth spurt often lands around 6 weeks.

You will not ruin your baby by feeding them "too often." Newborns can't be spoiled, and responding to hunger cues builds a strong milk supply and a well-fed baby. When in doubt in these early weeks, offer the breast or bottle.

Breastfed vs. formula-fed: what changes

Total daily intake is similar either way — roughly 20 to 30 ounces a day by the end of the first month. The difference is rhythm.

• Breastfed babies feed more often (every 2–3 hours) because breast milk digests quickly, and you can't see the ounces. Trust diaper counts and weight instead of trying to measure.
• Formula-fed babies often take slightly larger, less frequent bottles. A common guideline from the AAP is about 2.5 oz of formula per pound of body weight per day. So a 9-pound baby needs roughly 22–23 oz across 24 hours.

If you're pumping or bottle-feeding, use paced bottle feeding — hold the bottle more horizontally, keep baby upright, and pause often so they can decide when they're done. A slow-flow nipple helps. Our picks for gentle, easy-to-clean bottles are in the best baby bottles guide; we especially like the Dr. Brown's Options+ for gassy babies and the Comotomo Natural Feel for breast-to-bottle switching. If you're building a pumping routine, see the best breast pumps and our review of the Spectra S1 Plus.

The real "am I doing this right?" checklist

Ounces are reassuring, but diapers and weight are the numbers your pediatrician actually watches.

Diapers (after day 5):

• 6 or more wet diapers per day
• Regular stools — several a day early on for breastfed babies, which then spaces out
• Pale, odorless urine (dark or brick-red urine can signal dehydration — call your provider)

Weight:

• Newborns lose up to about 7–10% of birth weight in the first days — this is expected
• Back to birth weight by about 10–14 days
• Steady gain after that (roughly 0.5–1 oz per day in the first months)

Behavior:

• Feeds actively with audible swallows
• Settles or relaxes after most feeds
• Wakes on their own to eat

Feeding cues: don't wait for crying

Feed on demand rather than strictly by the clock. Early hunger cues include:

• Rooting (turning toward your hand or chest)
• Bringing hands to mouth
• Smacking or licking lips
• Stirring and squirming

Crying is a late cue. A frantic, overtired baby is harder to latch, so catching the early signs makes feeds smoother. Learning your baby's cues is one of the first things we cover for the newborn stage, and it pairs closely with early newborn sleep rhythms.

When to wake a sleeping newborn

Newborns are sleepy, and some would happily skip feeds. The American Academy of Pediatrics advises not letting a newborn go longer than about 4 hours between feeds until they've passed their birth weight and are gaining well. After your pediatrician gives the green light, you can let a healthy baby sleep longer stretches and wake to eat on their own.

A few important safety notes

• Never add cereal or anything else to a bottle to make a baby sleep longer. The AAP warns this is a choking hazard and can lead to overfeeding; it does not help sleep.
• Don't prop bottles. Propping raises the risk of choking and ear infections — always hold your baby and the bottle.
• Water isn't needed for babies under 6 months and can be dangerous. Breast milk or formula provides all the hydration a newborn needs.
• Follow formula mixing instructions exactly. Too-concentrated or too-diluted formula can make a baby sick.

For the emotional side of feeding — cluster feeding, cracked nipples, and the "is this normal?" spiral — our breastfeeding survival guide is written for 3 a.m. reading.

When to call your pediatrician

Reach out if your baby:

• Has fewer than 6 wet diapers a day after the first week
• Hasn't regained birth weight by 2 weeks
• Is consistently too sleepy to feed or won't wake for feeds
• Has dark urine, no tears, a dry mouth, or a sunken soft spot (signs of dehydration)
• Vomits forcefully after most feeds (different from normal spit-up)

Trust your gut. Feeding is the one thing you'll do more than a dozen times a day for months, so you'll quickly become the expert on your baby. In the meantime, count diapers, watch the scale at checkups, and let the ounces be a rough guide rather than a rulebook.