1 year old baby ate 6 days montelukast or diarrhea can be seen in infectious diarrhea disease, lactose intolerance, etc., the intervention needs to be based on the cause to intervene, such as bacterial infections caused by diarrheal diseases need anti-infective treatment. 1. Infectious diarrhea disease: such as bacterial (such as Escherichia coli) infections caused by infectious diarrhea disease, improve the routine examination of feces can be seen in the obvious white blood cells, only oral montelukast is symptomatic treatment, the effect may not be good, the treatment needs to be active use of antibacterial drugs, such as cefaclor and other anti-infective treatment. 2. Lactose intolerance: due to various reasons of lactase deficiency in the intestinal tract, diarrhea symptoms can occur after eating lactose-containing foods, taking montelukast for treatment may not be effective, such babies need to avoid eating lactose-containing foods. 3. Milk protein allergy: these babies eating milk protein can appear digestive symptoms, such as diarrhea, some may be accompanied by eczema and other symptoms, oral montelukast may appear poor therapeutic effect, for the age of babies need to be adjusted to the hydrolyzed protein formula when necessary. The above drugs need to be used under the guidance of a physician, it is recommended to actively seek medical attention, by the guidance of a specialist in the treatment.