Generally six months to start adding complementary foods is most appropriate. As the baby grows up, the gastrointestinal function gradually in maturity, the ability to digest food continues to increase, the baby’s demand for food types are also increasing, breastfeeding can not fully meet the baby’s needs for growth and development, generally in six months when you can give the baby to add complementary foods is most appropriate. The addition of complementary foods should follow the following two principles: 1. From small to large: the amount of complementary food can start with one spoon or two spoons, and then gradually increase according to the baby’s digestive condition. 2. From one to many: After the baby accepts one kind of food, then add another kind of food, so that allergies can be detected in time, and do not focus on adding to prevent indigestion of the baby.