For babies, their digestive system is immature, if complementary foods are added too early, it can affect the baby’s digestion and absorption, growth and development, and increase the metabolic burden. Generally speaking, protective factors such as the mucosal barrier of the baby’s gastrointestinal tract and the immune system will not be fully developed until around 6 months of age, so it is generally recommended that children be breastfed or formula fed within 6 months of birth. If complementary foods are added under such circumstances, it may lead to vomiting, diarrhea, bloating, etc., which may seriously affect the digestion and absorption of the baby and affect the growth and development of the baby. In addition, a child’s growth and development and dietary patterns during growth are all related to his or her age. If his or her normal patterns are changed, it may increase the burden on his or her metabolism, affect the development of his or her internal organs, or even cause damage. It is recommended to add complementary foods reasonably, generally from less to more, from one to many, from fine to coarse reasonably added.