Newborn babies have a small stomach capacity, while the amount of gastric juice secretion is small. The gastric emptying time varies with the type and nature of food. For breastfeeding, the gastric emptying time is 2~3 hours, for formula feeding, it is 3~4 hours, and for water, it is 1~2 hours. The total amount of milk for newborns is 450~480 ml, divided into 7~8 doses, 60~70 ml for each meal. From 15 days to the full moon, if the baby has normal digestion, each meal is about 60~100ml. After the baby is full-term to two months, the amount of milk gradually increases according to the weight, and the baby is fed 6~7 times a day, each time at an interval of 3.5~4 hours, and eats about 80~120ml per meal. Up to 150 ml can be eaten. From two to three months, feed 5~6 times a day, every four hours, and eat 150~200ml of milk each time. From three to six months, feed five times a day, every four hours, and eat 150~200 ml of milk per meal: from three to five months, and from five to six months, eat 200~250 ml of milk. At four months, start feeding supplementary food before breastfeeding. From six to nine months, feed milk every four hours, eat 200~250ml each time, change from four milk meals to three milk meals per day, and gradually on supplementary food from replacing half a meal to replacing one milk meal. The amount of medium sugar gradually decreases. From nine to twelve months, the whole day from eating three meals of milk to eating two meals of milk, 250 ml each time, still mastering to eat once every four hours, the other meals of complementary food. Feed water between each two milk meals.