Breast milk is rich in nutrients and easily absorbed by infants, so breastfeeding is the most ideal way. If breastfeeding breast milk is not enough to consider using milk powder (formula) mixed feeding, but need to pay attention to master the milk powder brewing temperature. Mixed feeding can be divided into two main ways, including the complementary teaching method and substitute teaching method: 1, complementary teaching method: more applicable to infants under 4 months of age feeding, each breastfeeding first with breast milk, both sides of the breast milk is basically empty, then supplemented with formula, if the next breastfeeding breast milk amount is sufficient, it is not necessary to add formula. This method ensures that the infant sucking stimulates the breast enough to help secrete milk, and also ensures the infant’s nutritional supply; 2. The substitution method: mostly applicable to infants over 6 months of age, one breast milk, one formula feeding rotation, for those who are inconvenienced breastfeeding can use this method, you can gradually replace breast milk with formula, the infant is more easily adapted. In addition, breast milk and formula should not be mixed together when breastfeeding to avoid the heat of formula destroying the nutrients in breast milk. It is recommended to give priority to breastfeeding, especially for infants less than 6 months old, to enhance fetal immunity. In addition, formula should be added from a small amount, pay attention to observe whether the infant has any adverse reaction after consumption, and if there is no adverse reaction, then gradually increase the amount.