The correct mixed feeding will not hurt the baby’s stomach, but when mixed feeding is wrong, it can affect the baby’s gastrointestinal tract function. However, for babies with poor gastrointestinal function, mixed feeding may lead to indigestion, so mothers should pay attention to the frequency and amount of mixed feeding to avoid affecting the baby’s development. Mixed feeding means that the daily breastfeeding is not enough due to various reasons and needs to be combined with milk powder and milk feeding, or gradually start to add complementary foods, but it should be noted that breast milk should be the main focus and try to ensure that the baby has 4-6 months of breastfeeding period, which can promote the development of the gastrointestinal tract and protect the stomach mucosa. It is recommended that mixed feeding be added in small doses to allow the baby to have a process of adaptation, while paying attention to the baby’s digestion after feeding. If the baby has long periods of indigestion such as burping and diarrhea after eating milk or milk powder, it is recommended to stop mixed feeding and take some probiotics to help regulate the function of the gastrointestinal tract. If everything is normal after mixed feeding, you can gradually add to the demand, generally will not cause harm to the gastrointestinal. In addition, there are two ways of mixed feeding, one is the complementary method, applicable to babies within 6 months, that is, breastfeeding > other dairy products; the other is the substitution method, that is, breastfeeding < other dairy products, applicable to babies over 6 months.