Enter your baby's weight and age to estimate how much formula or expressed breast milk they need per day and per feed.
Expressed breast milk follows the same rough guideline as formula — about 2.5 oz (150 ml) per pound of body weight per day for babies under 6 months, split across their usual number of feeds. Enter your baby's weight, age and feeds per day above for a personalized estimate, and adjust based on hunger and fullness cues.
Divide their estimated daily total by how many times they feed each day — the calculator above does this automatically once you enter their weight, age and feeds per day. Amounts per feed generally grow over the first few months, then level off and gradually decrease as solids are introduced.
Steady weight gain, regular wet and dirty diapers, and general contentment between feeds are the main signs your baby is getting enough — our Growth Percentile Calculator can help track weight gain over time. If you're ever concerned about intake, your pediatrician can check actual growth against expected patterns.
Premature babies often need different volumes and feeding schedules set by their care team, based on their corrected age and individual needs rather than a general guideline like this one. Treat this calculator as a starting point for full-term babies, and always follow your care team's specific plan for a premature baby.