Baby details
Guideline only: about 150ml per kg of body weight a day (range 120–180ml/kg) · roughly 15g of powder per 100ml — check your product’s scoop size · premature, low-birth-weight, or medically fragile babies should follow their pediatrician’s guidance instead.
150ml per kg of body weight a day
This goes by weight, not age — two babies both two months old but 4kg and 6kg need different amounts. The common pediatric rule of thumb is about 150ml per kilogram of body weight a day (range 120–180ml/kg). Divide the daily total by feeding count to get the per-feeding amount.
It’s a range, not one number
This calculator gives a range (120–180ml/kg) on purpose — if your baby leaves some or wants more within that range, that’s normal. Don’t force a baby to finish the calculated amount: a full baby turns away, a hungry one roots or fusses. Your baby’s own cues are more reliable than any calculator.
The daily total has a ceiling
Even as weight climbs, the daily total levels off around 1,000ml — pushing kg×150 straight through gives 1,200ml at 8kg, which is overfeeding. Around that age solid food starts taking formula’s place, so this calculator caps the total and tells you when it has.
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Frequently asked questions
QHow accurate is the range?
It’s a common pediatric rule of thumb (120–180ml per kg of body weight a day), not a personalized prescription. Steady weight gain and at least 6 wet diapers a day matter more than hitting an exact number.
QMy baby won’t finish the calculated amount — is something wrong?
Not necessarily. The range exists because appetite varies feeding to feeding. If weight gain and wet diapers are on track, eating somewhat less than the calculated amount is usually fine. Ask a pediatrician if you’re worried.