Eight months baby diarrhea is called diarrhea, often caused by acute gastroenteritis, treatment includes diet therapy, correction of water electrolyte disorders, medication and so on. 1. Diet therapy: eight month baby diarrhea eating and absorption is reduced, should continue to eat and drink, to meet the physiological needs, to supplement the loss of disease. 2. Correct water electrolyte disorders: persistent diarrhea may lead to eight-month-old babies show signs of dehydration, should be timely rehydration therapy. Mild to moderate dehydration can be used oral rehydration salts to replenish the amount of fluid loss; moderate to severe dehydration should be used intravenous rehydration, the first rapid expansion to improve circulation, and then slowly replenish the amount of loss and physiological needs. 3. Drug treatment: If the diarrhea is caused by pathogen infection, anti-infective treatment is needed, such as bacterial infection caused by diarrhea, cefazoxime anti-infective treatment can be prescribed. Such as rotavirus infection caused by diarrhea, generally do not need special application of antiviral drugs, can follow the doctor’s instructions with montelukast and other gastric mucosa protection treatment. Clinically, there are many causes of diarrhea in eight-month-old babies, some of which are due to allergies to added complementary foods, and some of which may be due to lactose intolerance, if the baby has diarrhea, it should be timely to go to the hospital, and under the guidance of the doctor for treatment.