Vitamin A exists in animal liver, eggs, milk and fresh vegetables, and carotene in vegetables can be converted into vitamin A in the liver. Vitamin D mainly exists in marine fish, animal liver, egg yolk and lean meat. It is not realistic to add complementary food to newborn babies, and the food they eat is relatively simple, so it is necessary to supplement some vitamin AD appropriately. Because vitamin AD is an essential nutrient for human development. If it is lacking, it will cause many diseases, and effective prevention is better. If older babies can supplement from food.