Weaning is a gradual transition from exclusive reliance on breastfeeding to diversified foods, usually by replacing human milk feedings with formula during the gradual weaning from breast milk. In addition to breast milk, semi-solid or solid foods are added to meet the energy and nutrient needs of breastfed children, and these foods are called complementary foods. The purpose of adding complementary foods is to supplement the shortage of nutrients in breast milk, to change the quality of infants’ food to meet their physiological needs and to prepare for weaning, and to gradually develop good eating habits in infants. The principles of adding complementary foods: from less to more, from thin to thick, from fine to coarse, from one to many. In order to make the infant’s digestive and absorption functions have a process of adaptation and stabilization, each food from the beginning of the addition of a small amount gradually increased to the required amount, generally through 7 to 10 days. Then add another kind of food. The time to add complementary foods] It is generally advocated that after 4 to 6 months of age, when breastfeeding alone cannot meet the needs of growth and development, complementary foods should be added to enter the breastfeeding exchange period in preparation for complete weaning. The addition of complementary foods can be started from 4 months of age, not later than 6 months of age. However, it should not be too early to replace breast milk with complementary foods. It should be added gradually when the infant is healthy and has normal digestive function. If the supplemental food is added in the middle of summer and the infant is growing well, it should be postponed for a few weeks until the weather is cooler. The method of adding complementary foods] 1, because small infants are not used to swallowing non-fluid food, the first few days of feeding often reflexively with the tongue to the food outward, while in order to develop the ability and habit of independent feeding, at the beginning of the addition of complementary foods, we must insist on spoon feeding, and the food to the back of the mouth so that the baby swallowed naturally, and then gradually shift to automatic feeding and swallowing complementary foods. 2, in order to make infants know the taste of various foods, and develop the habit of not favoring food and eating lightly, try not to add too much salt and seasonings to the complementary food of infants within 1 year old. 3.In the process of adding complementary foods, infants around 6 months old should not get more than 50% of the total energy required from solid foods, and should not feed less than 500 ml of milk per day. The order of complementary foods should be added first. Vegetable juice, fruit juice, vegetable puree, fruit puree, rice flour, meat puree, liver puree, fish puree, egg yolk, tofu, rice porridge, noodles, small wontons, small dumplings, bread. 1.If indigestion or allergy symptoms occur after adding a new complementary food, the new complementary food should be stopped immediately. Those with allergies should not eat the food they are allergic to and add other foods they are not allergic to. 2, indigestion need to wait for the digestive function to improve back to normal after restart. Adding complementary foods should be noted] Most food allergies in infants occur within the first two years of life. Food allergy refers to the body’s inability to develop or maintain immune tolerance to one or more food proteins. 95% of food allergies are caused by milk, eggs, peanuts, nuts, fish, soybeans, etc. 1. Milk is the most common allergen within the first year of life. 2.Egg is also a common food allergen in children under 2 years of age. Egg whites are more allergenic than egg yolks, and egg whites are not used in complementary foods for infants within 1 year of age. 3, soy protein is also prone to food allergies. 4, peanuts are one of the most common food groups that cause allergies in children and adults, and a large proportion of reported fatal allergic reactions caused by ingestion of food allergens are caused by peanuts. Unlike milk, eggs, and soy that cause allergies in children, children with peanut allergy are allergic for a long time and often have allergic reactions throughout their lives. 5, nuts in children caused by allergies are less common, nuts usually include almonds, cashews, hazelnuts, pecan nuts, pine nuts, pistachios. As with peanuts, nuts usually produce severe, lifelong reactions. 6, fish is the food that can cause allergies in children. Snails, mussels, oysters, scallops, clams, squid, octopus, shrimp, lobster, and crab are common allergens in adults, but relatively uncommon in children. These allergens, like peanuts, nuts, and fish, cause allergic reactions that last a lifetime and often lead to more severe clinical symptoms. 7, in children, wheat and other cereals is relatively uncommon a food allergen. Weaning does not in any way mean that infants and children no longer need to add dairy after weaning, but that adequate amounts of dairy products should be included in children’s recipes to replace breast milk according to their age needs. The age of complete weaning is usually around 1 year. The breastfeeding exchange period is usually available for several months. To allow baby to gradually adapt from eating habits and emotions, rich complementary foods have been added before complete weaning, baby can adapt to formula milk, to not affect baby’s health as a prerequisite, to be completely weaned when baby is healthy and the climate is suitable.