The principle of adding complementary foods to the baby: First, from little to much, that is, before breastfeeding to give the baby a small amount of iron-fortified rice flour, and gradually increase, eat with a spoon after 6-7 months can be replaced by 1 times the amount of milk. Second, from one to many, such as the introduction of vegetables, should be tasted 1-2 times a day for each kind of vegetable puree, until the infant is used to it after 3-4 months, and then change to another kind, in order to stimulate the development of the sense of taste. A single method of food introduction can be used to find out whether the infant will develop food allergy. Third, from fine to coarse, the transition from puree to mince can help babies learn the function of chewing and increase the density of food energy. Fourth, from soft to hard, as infants grow older, their food has a certain degree of hardness, to promote the eruption of the child’s teeth and the formation of chewing function. Fifth, pay attention to the development of eating skills, try to let the child actively participate in eating, such as 9 to 7 months of children can grasp the food, one year old children, can eat by themselves with a spoon.