The baby is a child under 1 year. Babies grow and develop particularly rapidly at this stage, which is the most vigorous stage in a person's life and weighs about 9000 ~10000g. Babies have good sucking and swallowing functions when they are born at term, and there are thick fat pads on their cheeks, which are helpful for sucking activities, while premature babies are poor. Sucking is a complex natural reflex, and serious diseases will affect sucking and make it weak. March on the Loess Plateau, like a baby's face, is unpredictable. When the child grows up, the amount of breast milk is insufficient or the mother can't breastfeed the baby under special circumstances, it is not appropriate to feed the baby with fresh milk or whole milk powder.