Three-year-old children with a fever of 39.3 degrees is divided into infectious and non-infectious causes, so the treatment method needs to be in addition to conventional physical cooling, the application of ibuprofen and other antipyretic drugs symptomatic treatment, but also need to treat the cause. 1. symptomatic treatment: three-year-old children 39.3 degrees belong to high fever, need to use antipyretic and analgesic drugs such as ibuprofen suspension drops. And can also be through the physical cooling methods to the child fever, such as using warm wet towels to wipe the child’s body. 2. Infectious diseases: the cause of high fever in three-year-old children is usually a bacterial or viral infection of the respiratory tract, after a detailed examination, you can follow the doctor’s instructions to use antibiotics such as cefixime, azithromycin and other drugs. If it is clear that the influenza virus infection can be treated with oseltamivir anti-infective therapy as prescribed by the doctor. In addition to the respiratory system, the presence of intracranial infections, urinary tract infections and other occult infections can also be assessed based on clinical symptoms. 3. non-infectious: three-year-old children non-infectious diseases such as blood system diseases of leukemia, immune system diseases of Kawasaki disease, juvenile idiopathic arthritis and so on can lead to baby fever. Need the child to go to the hospital after a detailed examination to determine the disease according to the specific classification to be chemotherapy, immunoglobulin or glucocorticoids and other drugs for treatment. A 3-year-old child with a fever of 39.3 degrees need to parents timely fever treatment, it is recommended to take the child to the hospital for a detailed examination of the cause of the disease, in accordance with the doctor’s instructions to be targeted treatment.