The newborn baby a milk on the poop if belongs to the physiological factors do not need to deal with, milk powder allergies need to change the milk powder, intestinal diseases can be taken probiotics (such as bacillus subtilis bacillus live bacterial powder) and so on. 1. physiological factors: the newborn baby a milk on the stool, may be the newborn baby digestive system development is not perfect, immature gastrointestinal function, and the stomach capacity is small, the milk is a component of the liquid, the stomach empties faster, if the stool is normal, weight gain is normal, there is no irritability crying, then do not need to deal with, is a normal phenomenon. 2. Milk powder allergy: If the newborn is formula-fed, allergic to the milk powder fed, there may be a milk on the stool, stool with mucus milk petals, or even blood, the baby is more irritable, crying. This situation needs to replace the deeply hydrolyzed milk powder for feeding. 3. Intestinal diseases: If the newborn baby milk on the stool, stool dilute watery or green with mucus, milk petals, then the need for laboratory tests on the stool, in order to clarify whether there are intestinal infections and other diseases. If gastrointestinal disorders are present, probiotics such as Bacillus subtilis can be used. The use of the above drugs need to follow the doctor’s instructions, newborns have to be analyzed by a doctor to clarify the cause of the poop after breastfeeding.