Not sure how much formula to put in the bottle? Enter your baby’s weight in pounds and ounces (or kilograms) and tap their age. You get a daily estimate in ounces and milliliters based on the American Academy of Pediatrics rule of thumb, the typical range UK guidance gives, how many feeds a day are usual at that age, and roughly how much to offer at each feed. Babies are not machines: some days they drink more, some days less, so follow hunger and fullness cues rather than pushing them to finish every bottle. This is a general estimate, not medical advice — premature babies and babies with health conditions need their pediatrician’s plan.
How it works: the daily estimate is 2½ oz of formula per pound of body weight (about 163 mL per kg) — the AAP’s rule of thumb — capped at 32 oz (about 950 mL) a day. The range uses the 150–200 mL per kg that UK guidance gives from the end of the first week, and the per-feed amount is the daily estimate divided by the usual number of feeds at that age. From 6 months, solid food gradually replaces some formula, so most babies settle at 24–32 oz a day. Enough formula usually shows as 6 or more wet diapers a day and steady weight gain. Every result is an estimate: premature babies, reflux, special formulas and slow weight gain need your pediatrician’s advice, and formula should always be mixed exactly as the label says.