When babies start to add complementary foods, we should remember that we should follow a key point, that is, from less to more, from fine to coarse, from one to many, where from less to more and from one to many, refers to the amount of baby complementary foods added. Generally 4-6 months old babies start to add complementary foods, are first from the iron fortified rice powder, from the beginning of the day 1 time, each time 1 spoon to add, gradually to 2 times a day, each time 1 spoon, gradually transition. As the age gradually increases, the amount added can be more and more, and the variety can also be more and more. At the beginning, it is recommended that mothers and fathers add only one kind of complementary food. When the baby does not have any allergic symptoms to this complementary food, a second or even a third kind of food can be introduced appropriately, but each time a new variety is added, it should be added separately to prevent allergic phenomena. Therefore, when adding complementary foods to babies in clinical settings, mothers and fathers must do so gradually, from less to more, from 1 to 2 or even more spoons, and from 1 to 2 kinds of food, from 1 kind of food alone to 2 kinds of food at the same time, and then to many kinds of food at the same time in order to avoid bloating, diarrhea and allergies.