Generally 4-6 months after birth should gradually add complementary foods, because the nutrients in the milk can not meet the needs of the child’s growth and development. The following principles should be followed when adding complementary foods: first, not too many portions, the baby’s food intake is relatively small, feeding complementary foods to master a small amount. If you can tolerate it, then appropriately give the child a little more to eat. Secondly, pay attention to the way of feeding, put the food into a bowl or cup and feed it with a spoon, so that the baby can gradually adapt to the eating habits and manners of adults. Third, feed one new food at a time. The principle to follow when adding complementary foods is to start with one and tolerate it before adding other foods or increasing the amount. Generally need 3-5 days of adaptation time. Fourth, observe the reaction after the addition of complementary foods, especially after the new addition of complementary foods, you need to observe whether there is a rash, diarrhea. If these conditions occur, it means that the child is intolerant to this food, consider suspending or replacing other varieties.