Four-month-old babies are mainly breastfed or formula, and it is generally recommended to add complementary foods after 6 months. Under normal circumstances generally adhere to breastfeeding for at least six months before adding complementary foods, four-month-old babies to breast milk or formula-based, if you add complementary foods to the child too early, it is easy to the baby’s gastrointestinal tract to a certain extent. When adding complementary foods should be gradual, follow the principle of from thin to thick, from small to large, from small to large, slowly let the baby adapt. Do not add too many samples at one time, too much. In order to avoid causing indigestion or allergy to the baby, the baby’s stomach and intestines will also be harmed. In the process of adding complementary foods, if there is any discomfort, it is recommended to consult a doctor in time.