Infants who poop after eating milk may have normal physiological conditions, or pathological conditions, such as lactose intolerance, allergies and so on. 1. Physiological situation: infants have higher basal metabolism, food is easier to be digested and absorbed, so stools are more frequent than adults. And food into the intestinal tract will stimulate the intestinal tract to accelerate peristalsis due to conditioned reflexes, so infants stool after eating milk is a physiological phenomenon, it is normal. 2. Pathological conditions: (1) Lactose intolerance: baby’s food contains lactose. If the baby can not digest lactose into galactose and glucose, there will be an increase in abdominal osmotic pressure, nausea, diarrhea, bloating and other symptoms. (2) Allergy: Milk protein allergy is mostly seen in formula-fed babies, which contain lactose and large proteins. When infants are allergic to proteins, they may have diarrhea and may also have hives. In addition to the above, infants pooping after eating milk can also be seen in enteritis and other causes, parents are advised to bring their infants to the hospital in a timely manner, with the help of the doctor to clarify the cause, and actively cooperate with the doctor to deal with or treat.