Immune factors in breast milk are not found in milk powder. Breast-fed babies' facial and oral nerves and muscles will be exercised, while babies who eat milk powder do not have such opportunities. There are more than 400 kinds of nutrients in breast milk and more than 100 kinds in milk powder. Most people who go to the hospital sick are babies who eat milk powder. Babies who eat breast milk have very good digestive ability, and most babies who eat milk powder have impaired stomach function.