1. After the first mouthful of milk (either breast milk or cow’s milk) reaches the baby’s gastrointestinal tract, it is equivalent to the formation of an entrapment film on the intestinal mucosa. Epigenetic – what kind of milk the child eats is programmed for his metabolism, etc. 2, if the baby’s first milk is breast milk, the composition of breast milk protein is mainly whey protein (containing a large number of active immunoglobulins), the baby’s gastrointestinal mucosa is formed on a layer of sandwich film is very dense and complete, the benefits are numerous: the baby’s immune function is strong, baby diarrhea, allergies are greatly reduced, the baby is less prone to metabolic syndrome, coronary heart disease, cardiovascular disease, diabetes and other chronic diseases. 3, if the baby’s first milk to eat cow’s milk (mainly casein), than children who eat breast milk in the baby’s intestinal mucosa to form a layer of laminated integrity greatly reduced. Therefore, the baby’s intestinal tract is prone to infection, allergies and other unfavorable factors increase. The newborn’s breast milk within 7 days of birth is called colostrum (colostrum contains a large amount of immunoglobulin), 7 days-14 days is called transition milk, and after 14 days is called mature milk. 4, the amount of breast milk is supply and demand: the first day of birth, the baby’s stomach is only the size of a glass ball, which can hold 3-5ml, so although the colostrum is very little, it is enough. On the third day, the baby’s stomach is the size of a walnut and can hold 20ml, and on the fifth day to about a week, the baby’s stomach is the size of a ping-pong ball. The amount of mother’s milk secretion, very importantly, depends on the child’s mouth sucking – sucking stimulation, the more stimulated the nipple mother’s milk increases day by day, and the fetus’ stomach grows day by day, the mother’s milk and the child’s stomach are compatible. Therefore, the mother’s milk is enough, do not be afraid that the baby does not eat enough, when the baby’s stomach is small, to feed on demand, multiple times. 5, eat full one of the keys: each time you eat milk, the first half of the milk is called foremilk, foremilk is mostly water, soluble vitamins, minerals, immunoglobulin high, the latter part of the milk is called hind milk, fat, lactose content is high, so the longer you eat milk each time, the more resistant the baby is to hunger. 6, eat full key two: baby eating milk must suck to the areola part, not just suck nipples. 90% of the mother’s milk is enough, just how to insist on it, if the mother does not insist, feel that the child is not full cry immediately add milk powder, breast milk will be less and less. 7, exclusive breastfeeding must be six months within six months, even water do not need to add, thirsty to drink the mother’s milk, hungry to drink the mother’s milk – on-demand feeding, six months later, with the baby’s growth and development of nutritional needs increase, exclusive breast milk nutrients are not enough, especially iron and other minerals, vitamins and other nutrients, so you must add Supplementary food, but continue breastfeeding, it is best to adhere to the age of two years or more than two years until natural weaning. Remember: Since babies eat formula with rubber nipples, it is convenient to suck up, while sucking breast milk is more difficult, so babies are used to sucking rubber nipples, they do not want to suck their mother’s milk – nipple illusion. 8, early sucking (within 1 hour after birth), early opening of milk, early contact. The first milk eaten after birth must be the mother’s milk, not only because its nutritional content is important, but also because it directly affects the success of breastfeeding in the future. The earlier the baby eats, the more she eats, the more she eats, and the longer she eats, the sooner and more her mother’s milk will be laid down to meet her baby’s needs. When a baby born by cesarean section is just born, its intestinal tract is sterile (intestinal flora colonization deferred), and it is more prone to infection and allergy than a baby born by normal delivery, so it is more necessary to eat the mother’s colostrum as early as possible after birth. 9. In the case of formula feeding: babies with low birth weight (less than 2500 grams), or babies who suffocate during birth, also need to take mother’s milk first, and monitor baby’s blood sugar during the feeding process, and only if there is hypoglycemia, it is necessary to add formula to the baby like medicine. If the baby is already hypoglycemic at birth, its first milk is only needed for formula. Therefore, the prerequisite for a baby to take formula should be to suckle the mother’s colostrum sufficiently and monitor its blood sugar for abnormalities before it needs to be given formula as if it were medicine.