Baby diarrhea first and then fever may be caused by intestinal viral or bacterial infection, may also be caused by diarrhea followed by bacterial or viral infection, its treatment above is mainly the following: First, the cause of treatment, if it is caused by viral infection is usually symptomatic treatment, no special antiviral drug treatment, if it is bacterial infection usually will take amoxicillin or cephalosporin antibiotics Anti-infection treatment. Second, promptly reduce the fever, if the fever exceeds 38.5 ℃ axillary temperature should promptly take antipyretic drugs, such as ibuprofen. Third, correct dehydration, you should drink hypotonic oral rehydration salts to prevent and correct dehydration. Fourth, you can take montelukast on an empty stomach to stop diarrhea, you can also take probiotics to regulate gastrointestinal function.