Infants should be exclusively breastfed up to 6 months of age without adding liquid and solid foods such as water, juice, etc. to avoid reducing the infant’s breast milk intake and thus affecting the mother’s milk production. From 6 months of age, breastfeeding should be continued until 2 years of age, based on the addition of other foods. With the growth and development, digestive ability gradually improves, and pure milk feeding cannot fully meet the growth and development needs of infants after 6 months of age, so infants need to gradually switch from pure milk liquid food to solid food, a process called food conversion (the old name of complementary food addition). If weaned from breast milk during infancy, infants still need to maintain a total milk intake of about 800 ml/day. The nutritional needs of children include nutrients, nutritional behaviors and nutritional environment. In the liquid food feeding stage, pureed food introduction stage and solid food feeding stage of the infant and young child feeding process, not only nutrient intake should be considered, but also feeding or eating behaviors, as well as the eating environment, so that infants and young children can develop good eating habits while obtaining adequate and balanced nutrient intake. Nutrient supplements or high-density nutrient-fortified foods based on soy or cereal can be used when resources are scarce and the daily diet cannot meet the nutritional needs of infants. 1. Age: The recommended age to begin introducing non-dairy pureed foods is 6 months of age, no earlier than 4 months of age. At this time, the infant’s milk intake is stable, about 180 ml/time, with good growth and development, suggesting that the infant has the digestive ability to accept other foods. 2, types: (1) the first stage of food: should first choose to meet the needs of growth, easy to absorb, not easy to produce allergies cereal, preferably fortified with iron rice flour, rice flour can be blended with milk; the second introduction of food is root vegetables, fruits, the main purpose is to train the infant’s sense of taste. Food should be spoon fed to help train swallowing function. (2) Second-stage foods: The second-stage foods for infants are gradually introduced from 7 to 9 months of age, including animal foods such as meat, eggs, fish and soy products. The foods introduced should be based on local foods, paying attention to the texture, nutrient density, hygiene and variety of preparation methods. (3) Method: Infant food conversion period is the process of gradually getting used to other foods, the introduced food should be from little to much, first feeding infants a small amount of iron-fortified rice flour, from 1 to 2 spoons to several spoons, until a meal; the introduced food should be one to many, infants accept a new food generally need to try 8 to 10 times, about 3 to 5 days, until the infant is used to the taste before changing to another, in order to stimulate the development of taste. The method of introducing single foods one at a time can help keep track of whether infants have food allergies and identify allergens. (4) Eating skills training: food conversion helps infants’ neuropsychological development, and the process of introducing food should pay attention to the texture of food and develop children’s eating skills, such as eating with spoons and cups can promote oral coordination and learning to swallow; transitioning from muddy food to minced food can help learn to chew and increase the energy density of food; grasping food with hands can increase infants’ interest in eating, and is also conducive to promoting Hand-eye coordination and the development of children’s independent eating ability. In the process of food conversion, the texture and variety of foods infants eat gradually approach those of adults, and their eating skills gradually mature. Caution: The infant can drink milk after eating, naturally forming a meal instead of a milk, and the food introduced should not affect the total amount of milk; food is light, without salt, less sugar and oil; do not consume honey water or sugar water, and try not to drink fruit juice.