Baby Feeding Amount Calculator
Estimate how much formula your baby needs from their age and weight — per feed, per day, and how many feeds to plan for.
Getting feeds right in the early months
In the first months, milk is everything, and new parents worry most about whether it's enough. A weight-based estimate gives you a sensible starting bottle size and a feel for the day's rhythm — then your baby's cues and their diapers fill in the rest.
Pair feeds with rest using the Baby Sleep Schedule Planner, check the trend with the Baby Growth Percentile Calculator, and plan supplies with the Diaper Size & Quantity Calculator.
Frequently Asked Questions
How much formula does my baby need?
A widely used rule of thumb is about 150 ml of formula per kilogram of body weight per day (roughly 2.5 oz per pound), spread across the day's feeds. So a 4 kg baby needs around 600 ml a day. Intake is capped near 960 ml (32 oz) a day — beyond that, most babies are getting enough, and more can mean overfeeding.
How many times a day should a baby feed?
Newborns feed little and often — about 8 times in 24 hours — and the number of feeds drops as they grow and take more per feed: roughly 7 feeds around one month, 6 by a few months, and 5 or fewer once solids start. This calculator divides the daily total by an age-based feed count to suggest a per-feed amount.
Does this apply to breastfed babies?
No — these amounts are for formula feeding, where you can measure what goes in. Breastfed babies self-regulate at the breast, so there's no bottle amount to hit; you follow their cues and watch diapers and weight gain instead. If you're combination feeding, use this only for the formula portion.
What if my baby wants more or less than the estimate?
Trust your baby over the number. Hunger and fullness cues — rooting and hand-to-mouth versus turning away and slowing down — are the real guide, and appetite varies day to day and through growth spurts. If your baby is consistently far from these figures, isn't gaining well, or seems unsettled after feeds, talk to your pediatrician.
Informational estimate for formula feeding only, not medical or nutritional advice. Feed on your baby's cues and consult your pediatrician about intake, weight gain, or any feeding concerns.