Babies can add complementary foods at the age of 4 months. In the process of adding complementary foods, it is necessary to gradually, avoiding too much complementary food at one time, which causes indigestion, diarrhea, constipation and so on. When adding, first try to add rice flour, because it belongs to the starchy food, can promote intestinal peristalsis good absorption. In addition, you can add some fruit puree, you can use apples or bananas, mashed and then made into a puree, you can also buy the ready-made processed fruit puree in the maternity store. Slowly you can add some egg yolks, you can start with 1/4 egg yolks, and then adapt to 3-4 days later, then change to 1/2 egg yolks, and then gradually and slowly transition to 1 egg yolk.