The cause of the baby’s first diarrhea and then fever may be gastrointestinal infection, indigestion combined with upper respiratory tract infection and other causes, need to be based on the cause of the targeted treatment, including the use of probiotics, ibuprofen, antibiotics and other drugs. 1. Gastrointestinal infection: the use of drugs is mainly based on the pathogen of the infection to decide, you can use montelukast to protect the mucosa of the gastrointestinal tract, improve the symptoms of diarrhea, and according to the results of the drug sensitivity to choose the appropriate antibiotics for treatment, commonly used antibiotics include azithromycin, cephalosporin and so on. If the pathogen is a virus, supportive treatment is generally sufficient, and the disease is generally self-limiting. 2. dyspepsia combined with upper respiratory tract infection: for dyspepsia, you can use probiotics, such as bacillus subtilis bacillus granules, etc., to adjust the intestinal flora, so as to alleviate the symptoms of diarrhea; for the fever, you can use ibuprofen, acetaminophen, and other medicines or the use of physical hypothermia treatment. If your baby has diarrhea followed by fever, you should consult a doctor for a clear diagnosis and targeted treatment. The above drugs should be used under the guidance of a doctor.