After four months, the nutrition contained in breast milk can not meet the needs of children’s growth and development, it is necessary to add complementary foods, which can ensure a balanced nutrition of children and provide nutrients lacking in breast milk. The principle of adding complementary foods to babies is to feed them in small amounts and gradually increase the amount of food, from thin to thick, from coarse to fine, choose to feed with a small spoon, gradually transition from milk to solid food, to give the baby’s gastrointestinal adaptation process. 4-6 months, just from the transition of breast milk, at this time you can feed the baby thin and soft food, such as rice soup, rice paste, fruit juice, vegetable juice, egg custard, egg yolk puree, fruit puree, vegetable puree, etc.; 7 -At 9 months, babies can eat slightly thicker foods, such as tofu, minced meat, mashed meat, mashed fish, etc. At 10-12 months, babies’ intestines have begun to adapt to solid foods, and they can be fed thick porridge, soft rice, soft bread, soft noodles, and meat sauce. When babies first start to add complementary foods at four months, they should be careful not to give them too much at once to prevent accumulation of food, indigestion, abdominal pain, bloating, diarrhea and other discomforts. It is best to add complementary foods in the right amount according to the baby’s height and weight and other comprehensive development indicators to prevent excessive intake that is not conducive to digestion.