Babies should add complementary foods on time when they reach six months, whether they are breastfed or artificially fed. The main reason is to compensate for the lack of nutrients as well as to exercise the digestive function of the gastrointestinal tract, promote the baby’s chewing ability and lay a good foundation for weaning. Babies should add complementary foods according to the principles of from one to many, from a small amount to a large amount, from thin to thick, from fine to coarse. When adding complementary foods, you should try one kind first and start with a small amount, until the baby is willing to accept it and the stool is normal, then the amount of complementary foods can gradually increase. If the baby is sick, has indigestion or the weather is hot, you should hold off adding new complementary foods to avoid the occurrence or aggravation of indigestion.