How much formula or expressed milk does your baby need per day? Calculate daily volume and per-feed amounts based on your baby's current weight and age.
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Enter your baby's weight and age to calculate how much they need per feed and per day.
Feeding made easier. Anti-colic bottles reduce air intake during feeds, helping with wind and discomfort.
The standard formula is 150–200 ml per kg of body weight per day for formula-fed babies under 6 months. This is split across feeds: typically 8 feeds/day in the early weeks, reducing to 5–6 by 3–4 months. The NHS uses 150 ml/kg/day as the standard recommendation.
Breastfed babies cannot be volume-measured in the same way — they self-regulate intake. If exclusively breastfeeding, feed on demand and trust your baby's hunger and fullness cues rather than counting ml. These calculations apply to expressed breast milk and formula only.
FAQs
Hunger cues after a feed (rooting, sucking fists, fussing) can also indicate wind, tiredness or the need to suck for comfort rather than nutrition. Try winding first. If your baby consistently seems unsatisfied, increase each feed by 30ml and see if this helps. Don't force more if baby is satisfied. Regular weight gain is the best indicator of adequate intake.
Move up a teat size when your baby is taking longer than 30 minutes per feed or seems frustrated. Volume naturally increases as babies grow — follow your baby's weight gain. The calculation here adjusts automatically as you update the weight. Most formula-fed babies settle into a rhythm of 150–180ml per feed by 8–10 weeks.
It's possible, though less common than parents fear. Signs of overfeeding: frequent vomiting (not just posseting), excessive weight gain, discomfort and fussiness after feeds. A consistently vomiting, uncomfortable baby may benefit from smaller, more frequent feeds rather than large volumes. Always follow your baby's hunger and fullness cues — a satisfied, settled baby who's gaining well is not being overfed.