How much formula?

This calculator follows the American Academy of Pediatrics guideline for formula-fed babies: roughly 2.5 ounces of formula per pound of body weight per day, up to a maximum of about 32 ounces a day. That daily total is then split across a typical number of feedings for the baby's age to get a per-feeding amount. This is a population-level guideline, not a fixed target — individual babies commonly run about 20% above or below it, and that's normal.

Newborns eat smaller amounts more often; older babies take fewer, larger feedings. In practice that generally looks like: under 1 month old, about 10 feedings a day, roughly every 2–3 hours; around 1 month, about 8 feedings a day, roughly every 3 hours; 2–3 months, about 6 feedings a day, roughly every 3–4 hours; 4–5 months, about 5 feedings a day, roughly every 4–5 hours; and by 6 months and beyond, about 4 feedings a day as solid foods start filling in the rest of a baby's nutrition.

Watch the baby, not the bottle. Hunger cues — rooting, hand-to-mouth movements, fussiness — and fullness cues — turning away, slowing down, falling asleep — matter more than hitting an exact ounce number. If your baby consistently finishes every bottle and still seems hungry afterward, it's fine to offer more. If they regularly leave formula behind, you can offer less next time.

Amounts can shift with growth spurts, illness, or ordinary day-to-day appetite changes, so treat the numbers above as a starting point rather than a strict schedule. If you have questions about your baby's intake, growth, or feeding schedule, check with your pediatrician — this tool gives a general estimate, not personalized medical advice.

Source: HealthyChildren.org (American Academy of Pediatrics) — "Amount and Schedule of Formula Feedings."