If a 4-year-old baby has diarrhea without symptoms of infection and poisoning, such as fever, poor mental health, or symptoms of dehydration such as obvious thirst and little urination, the condition is relatively mild and can be treated with oral medication at home, usually with probiotics such as bifidobacterium, and also with montelukast on an empty stomach to stop the diarrhea. If a 4-year-old baby has diarrhea along with high fever, poor spirit and dehydration, he or she should drink hypotonic oral rehydration solution to prevent and correct dehydration, and should go to the hospital for routine blood tests for C-reactive protein and stool routine plus occult blood to understand the status of the infection and treat the cause. If it is a viral infection is generally symptomatic treatment, if there is a basis for bacterial infection, commonly used amoxicillin or cephalosporin antibiotics treatment.