The weight rule for formula
The American Academy of Pediatrics gives an average of about 2.5 ounces of formula per pound of body weight per day, which is about 165 ml per kilogram. A 10 pound baby averages around 25 ounces a day. Spread over 7 feeds, that is about 3.5 ounces per bottle. Most babies should not need more than about 32 ounces in 24 hours.
Breast milk in a bottle
Breastfed babies take in a fairly steady amount between 1 and 6 months: about 25 ounces (750 ml) a day on average, with a normal range of roughly 19 to 30 ounces. Unlike formula, the daily total does not climb much with weight during this stretch. Divide the daily amount by the number of feeds to estimate a bottle. In the first weeks, bottles are smaller, often 1 to 2 ounces in week one and 2 to 3 ounces by weeks two to four.
Hungry or full?
- Hunger cues: rooting, sucking on hands, lip smacking, and fussing. Crying is a late cue.
- Fullness cues: turning away, slowing down, relaxed hands, and falling asleep.
- Paced bottle feeding helps babies stop when full. Let your baby set the pace instead of finishing the bottle.
When to call your pediatrician
Call if your baby has noticeably fewer wet diapers, seems hungry after every feed for days, regularly wants more than about 32 ounces of formula, vomits forcefully, or is not gaining weight. Our guides on signs of dehydration and hunger cues go deeper.
Common questions
How many ounces of formula should my baby drink?
The AAP's average guideline is about 2.5 ounces of formula per pound of body weight per day, and usually no more than about 32 ounces in 24 hours. In the first week that is often 1 to 2 ounces per feed, rising to 3 to 4 ounces per feed by the end of the first month, and 6 to 8 ounces at each of 4 or 5 feeds by 6 months.
How much breast milk should a baby drink from a bottle?
Between 1 and 6 months, exclusively breastfed babies take in about 25 ounces (750 ml) a day on average, with a typical range of about 19 to 30 ounces. Divide that by the number of feeds in a day to estimate a bottle. For example, 25 ounces over 8 feeds is about 3 ounces per bottle.
Is the calculator medical advice?
No. It shows averages from public pediatric guidance. Babies regulate their own intake and needs vary. If you are worried about how much your baby eats, wet diapers, or weight gain, call your pediatrician.
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