How much should a 1-month-old eat?

How much a 1-month-old drinks

Compared with 3 weeks: up to an ounce more per bottle and, for many babies, one fewer feed. For a baby of typical weight (9½ lb, WHO median). A heavier baby drinks a little more, a lighter one a little less: about 2½ oz per pound a day (about 165 ml per kg), rarely more than about 32 oz (960 ml) in 24 hours (AAP). The calculator above does it for your baby's weight. Night feeds are a typical picture, not a target: babies vary a lot.

What's different at this age

A more predictable day. The AAP describes a formula-fed baby at the end of the first month as taking at least 3 to 4 ounces per feed on a fairly predictable schedule, about every 3 to 4 hours. Breastfed babies feed more often and in smaller amounts, still typically 8–12 times a day.

By weight, not just by age. A useful check is about 2½ ounces of formula per pound of body weight per day (about 165 ml per kg), and rarely more than about 32 ounces (960 ml) in 24 hours (AAP). For a 9½-pound baby that's about 24 ounces. The calculator does this sum for your baby's weight.

Another spurt around 6 weeks. A few hungrier days around 6 weeks are common (SZÚ). They pass; your baby's own cues are the guide.

Night feeds

Many 1-month-olds still feed 2 or 3 times at night. One longer stretch of 4–5 hours often appears, frequently right after bedtime. Your baby's growth decides how long you can let them sleep: if they're back to birth weight and gaining well, many pediatricians are happy for that stretch to happen.

Breastfed babies: what to watch instead of ounces

At the breast there is nothing to count, and you don't need to. Breastfed babies feed on cue, typically 8–12 times a day in the early months (AAP); in one study of 1–6-month-olds the range was 6 to 18 feeds a day, and how often a baby fed said nothing about how much milk their mother made (Kent 2006). Watch the signs below instead. For a bottle of pumped milk, plan on about 25 ounces (750 ml) a day divided by the number of feeds: this amount hardly changes from 1 to 6 months (KellyMom).

Is my baby getting enough?

• Wet diapers: 6 or more a day, pale and not smelly (AAP).
• Growth along their own curve on the WHO charts (AAP). Our growth percentile calculator shows where your baby sits; the curve matters more than the number.
• Content after most feeds: relaxed hands, settled for a while (CDC).

Hungry or full? Paced bottle feeding

Hungry: hands to mouth, turning toward the breast or bottle, puckering, smacking or licking lips, clenched hands (CDC). Crying is a late sign. Full: closes their mouth, turns away from the breast or bottle, relaxes their hands (CDC).

Paced bottle feeding lets your baby set the speed: hold them fairly upright, keep the bottle closer to horizontal so milk flows only while they suck, and pause every few minutes (Kassing 2002). The NHS puts it simply: be guided by your baby, give them plenty of time and don't force them to finish. Leftover milk means it worked.

When to call the doctor

• Fever of 100.4 °F (38 °C) or more under 3 months: call right away (AAP).
• Signs of dehydration: fewer wet diapers, a sunken soft spot, few or no tears, drowsiness (NHS).
• Vomiting a lot, forcefully, or a baby who seems in pain (NHS).
• Wants to eat all the time, even when full, or has trouble gaining weight (AAP).

Trust your instinct: if your baby seems unwell, call, whatever the numbers say.

Born early? Use the corrected age for the number of feeds and for starting solids, and real weight for the amounts. Our corrected age calculator works it out.

Questions

Feeding by age

All ages: the baby feeding chart · the full feeding calculator · how to prepare formula safely · water and tea

Same age: weight percentiles · wake windows and naps