The amount of milk for a four-month-old baby is about 800ml/day, and the amount of milk is 150-200ml for 5-6 feedings per day, but it still needs to be fed on demand and cannot be generalized. For formula-fed babies, the amount of milk fed is calculated according to body weight, usually about 120ml per kilogram of body weight per day, or even more. More than four months of the baby according to the weight calculation formula (weight kg = 3 + 0.7 × age in months), about 6 ~ 7kg, this time the daily amount of milk about 800ml / day or so, each time 150 ~ 200ml, every 3 ~ 4 hours during the day to feed the milk, the night can be appropriate to extend the feeding time. If you are exclusively breastfeeding, the amount of milk is supplied according to the baby’s needs, and the number of feedings is usually once every 3~4 hours, and there is no strict regulation. Specific feeding methods vary according to the baby’s physical condition and the addition of complementary foods, and cannot be generalized.