The fever of small children is mostly caused by bacterial infections, mycoplasma infections and viral infections, which can be treated with antibiotics, antiviral drugs and antipyretic drugs as prescribed by the doctor. 1. Bacterial infections: you can improve the blood culture, sputum culture and other tests, clear pathogens, waiting for the results at the same time can be empirical use of antibiotics anti-infective treatment, commonly used amoxicillin clavulanate potassium anti-infective, and so on the results of the return of the results of the sensitivity of the results of the use of antibiotics adjusted in a timely manner. 2. Mycoplasma infection: Mycoplasma infection can often occur in school-age children, such as sputum mycoplasma nucleic acid PCR positive. If the sputum mycoplasma nucleic acid PCR is positive, then azithromycin can be given under the guidance of the doctor for anti-infection treatment. 3. Viral infections: mostly self-limiting, can take antipyretic drugs for symptomatic treatment, commonly used drugs are ibuprofen granules, acetaminophen granules and so on. In addition, it can also be given to rehydration, physical cooling and other supportive treatment. Clinical causes of fever in babies are many, such as Kawasaki disease, septic osteoarthritis, infectious mononucleosis, toddler rash and other diseases can cause fever in babies, it is recommended that if the baby has a fever, it should be timely to seek medical attention, under the guidance of the doctor to improve the physical examination, combined with laboratory tests to be a clear diagnosis of the targeted treatment.