Complementary foods can be added appropriately before and after vaccination. Before and after vaccination, some complementary foods can be added, such as pureed vegetables, pureed fruits, rice flour, etc., which can increase energy and vitamin intake for infants and children, as well as improve the flavor of food. Infants and young children may experience organic discomfort after vaccination, such as mild fever, diarrhea, etc. The above conditions may cause infants to cry in discomfort. Before and after vaccination, it is not recommended to add supplementary food that is not easy to digest, such as meat, or supplementary food that may cause allergies in infants and young children, such as egg yolk, fish and shrimp. Therefore, before and after vaccination, infants and young children can add supplemental food, but need to pay attention to the type of supplemental food, to avoid aggravating the discomfort of infants and young children.