Bottle Calculator
How much breast milk or formula does your baby need per day?
Feeding type
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Calculate how much formula or expressed breast milk your baby needs per feed and per day, based on their current weight and age. Our bottle calculator uses the standard 150 ml/kg/day guideline as a starting point — always a helpful reference, though your baby's individual hunger cues should guide actual feeding.
Frequently asked questions
How much milk does a newborn need per feed?
Most newborns take 60–90 ml (2–3 oz) per feed in the first days, increasing to 120–150 ml (4–5 oz) by one month. Feed on demand and watch for hunger cues (rooting, sucking fists) and fullness cues (turning away, slowing down).
How many feeds per day does a baby need?
Newborns typically feed 8–12 times per day (every 2–3 hours). By 3–4 months, many babies feed 6–8 times per day. Once solids start around 6 months, the number of milk feeds gradually reduces.
How do I know if my baby is getting enough milk?
Signs your baby is getting enough include steady weight gain, 6 or more wet nappies per day, and seeming content between feeds. Contact your health visitor or GP if you're concerned about your baby's intake or weight gain.
Is the 150 ml per kg per day guideline accurate?
The 150 ml/kg/day guideline is a general starting point used by many healthcare professionals for formula-fed babies. Individual needs vary — your baby may need slightly more or less. Always follow guidance from your health visitor or doctor.