Babies have diarrhea all the time, one is physiological diarrhea and the other is pathological diarrhea, such as lactose intolerance, food allergy, intestinal infection. Pathological diarrhea requires prompt medical attention and routine stool examination to clarify the cause and then treatment. Common causes and treatment a. Physiological diarrhea is common in infants under six months of age, with a relatively fat body type, and accompanied by wetness. The diarrhea is usually present soon after birth, with an increase in the number of stools, but no other discomfort. No special treatment is generally required, and can be relieved by itself after the addition of complementary foods. Second, pathological diarrhea 1, lactose intolerance: some infants can be lactose intolerance due to insufficient secretion of lactase, if the feeding of breast milk can cause diarrhea, generally without special treatment. Normally, you can replace the lactose-free formula, and when the diarrhea symptoms improve, you can cure the degree of tolerance of the baby, gradually increase the number of breastfeeding, or use breastfeeding lactose formula mixed feeding; 2, food allergies: babies who have added complementary foods, usually can be caused by allergies to milk, eggs, etc.. If the baby is in the breastfeeding period, can be due to the mother’s allergic reaction, resulting in repeated allergic attacks in the baby’s digestive tract, usually manifested as long-term diarrhea and other symptoms. It can be treated with loratadine anti-allergy medication as prescribed by the doctor, and usually avoid eating foods that cause allergies, such as replacing hydrolyzed milk powder; 3. Intestinal infection: Inflammation of the intestinal tract due to viral or bacterial infection, which in turn causes diarrhea. It needs to be treated with montelukast, aluminum phosphate gel, amoxicillin and other drugs under the guidance of a professional doctor. Parents should pay attention to the state of their children when they have diarrhea and can prevent the occurrence of dehydration by appropriate hydration. However, if dehydration occurs, prompt medical attention must be sought and intravenous or oral rehydration must be administered according to medical advice to correct dehydration.