How much milk does my baby need?

For a healthy, full-term formula-fed baby, the American Academy of Pediatrics' rule of thumb is about 2.5 ounces (75 mL) of formula per 24 hours for every pound of body weight — so a 9-pound baby is around 22 ounces a day, and a 12-pound baby around 30. Most babies don't need more than roughly 32 ounces (960 mL) in 24 hours, so that acts as a ceiling. That daily total is spread across feeds: in the first weeks, 8 to 12 small feeds; by a few months old, fewer and larger ones. This calculator does exactly that arithmetic and shows the working. Treat the result as an average to sanity-check against, not a quota — babies take what they need at each feed and their day-to-day totals genuinely vary. If your baby consistently wants far more or far less, that's worth mentioning to your pediatrician rather than simply adding or holding back ounces.

You can't — and don't need to — measure ounces at the breast, which is exactly why this tool doesn't put a number on breastfeeding. Exclusively breastfed babies feed on demand: usually 8 to 12 times in 24 hours, roughly every 1 to 3 hours, following the baby's cues rather than a clock or a target. Instead of counting ounces, you watch the signs that feeding is working: steady weight gain along their growth curve, about 6 or more wet diapers a day after the first week, regular stools, and a baby who seems content and relaxed after most feeds. Frequent feeding is normal and actually helps build your milk supply. If you're worried your baby isn't getting enough — few wet diapers, poor weight gain, or a baby who is very sleepy and hard to rouse for feeds — that's a reason to see your pediatrician or a lactation consultant, not to switch to counting milliliters.

Usually not. The single most important thing to know about feeding amounts is that healthy babies self-regulate — they take what they need and stop when they're full, and no two feeds are identical. A baby leaving an ounce in the bottle, or draining it and rooting for more, is normal appetite, not a problem to solve by forcing the last ounce or rigidly capping the total. Follow fullness cues (turning away, slowing, unlatching, pushing the bottle out) and hunger cues (rooting, hands to mouth, lip-smacking) over any calculated figure. The number this tool gives is a rough average across a day, not a per-feed rule. What does deserve a call is a pattern, not a single feed: a baby consistently taking much less than expected with few wet diapers or poor weight gain, or one who seems hungry far beyond the ~32-oz-a-day ceiling — either way, your pediatrician is the right person to sort out why.

Often, and in small amounts. In the first weeks a newborn typically feeds 8 to 12 times in 24 hours — breastfed babies roughly every 1 to 3 hours, formula-fed babies roughly every 2 to 3 hours — because their stomachs are tiny and empty quickly. Formula-fed newborns often take just 1 to 3 ounces a feed at first. As babies grow they take more per feed and stretch the gaps out, so by a few months old you'll see fewer, larger feeds. One newborn-specific point: while you generally follow a baby's hunger cues, a very young newborn who sleeps through feeds and isn't yet back to birth weight may need to be woken to eat every few hours — check with your pediatrician about when it's safe to let your baby sleep longer. Cluster feeding, where a baby bunches several feeds close together (often in the evening), is also normal and doesn't mean your supply is low.

This calculator is a general guide for healthy, full-term babies, and it can't assess your particular baby — so treat any of these as a prompt to call your pediatrician: far fewer wet diapers than usual (fewer than about 6 a day after the first week), no weight gain or weight loss between visits, a baby who is very sleepy or hard to wake for feeds or seems too weak to feed, refusing feeds or taking much less than usual for more than a feed or two, or signs of dehydration such as a dry mouth, no tears when crying, or a sunken soft spot. A baby who is lethargic, floppy, or showing dehydration should be seen the same day, urgently. Premature babies and babies with medical or growth concerns are fed on a plan set by their care team — follow their numbers, not this general rule. When in doubt about your baby's feeding, weight, or wet diapers, your pediatrician would always rather you asked.

Yes. This calculator runs entirely in your browser: your baby's weight and the answers you choose are worked out on your own device and are never sent to a server, stored, or shared — close the tab and they're gone. There's no account and nothing to delete. What you get back is general educational information based on published AAP, CDC, and MedlinePlus guidance for healthy, full-term babies; it isn't medical advice, a diagnosis, or a feeding prescription, and it doesn't replace your pediatrician, who knows your baby's growth and history.