Babies over 5 months old who have weak digestive ability are not suitable to add complementary food for the time being. It is recommended to wait until the baby is 6 months old before starting to eat complementary foods. Five-month-old babies are still relatively small, not necessarily suitable for adding complementary foods, if the baby’s digestive ability is relatively weak, usually often have indigestion phenomenon, for example, often have milk petals in the stool is generally not suitable for premature addition of complementary foods. Early addition of complementary foods, may be due to the addition of complementary foods to reduce the intake of breast milk, due to the reduction of protective factors in breast milk and increase the risk of disease, due to complementary foods not as clean as breast milk or difficult to digest and increase the risk of diarrhea, due to the baby can not be well digested and assimilated non-human proteins and increase the risk of allergic diseases and so on. Therefore, it is not recommended to add complementary foods for babies over five months old, and it is better to wait until they reach six months old before starting to eat.