Work out breastfeeding calorie needs instantly with clear inputs, formula shown and shareable results.
Adds the lactation energy increment of about 500 kcal a day in the first six months, scaled by how much of the infant's intake is breast milk.
Lactation increments
+500 kcal/day for the first 6 months and +400 kcal/day from 7 to 12 months of exclusive breastfeeding; about 80% of that appears as milk energy
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
It raises energy needs, so a modest deficit is usually easy, but very large deficits can reduce milk supply.
Around 3 litres a day in total including food, since milk output alone is about 750 mL.