A three-year-old baby with a fever of 39°C without a runny nose or cough must be clearly diagnosed with the cause of the illness before targeted treatment and medication can be administered. Only fever without other symptoms can be caused by a variety of reasons, such as infectious factors and non-infectious factors, can be through the general treatment, the cause of treatment, symptomatic treatment. 1. General treatment: During the period of fever, you need to drink more warm water to promote metabolism, strengthen nursing care and keep warm, avoid getting cold, and eat some fresh vegetables and fruits. 2. Treatment: If it is caused by bacterial infection, antibacterial drugs such as cefixime granules can be applied under the guidance of physicians; if it is caused by non-infectious factors such as leukemia, it will be treated by radiotherapy, chemotherapy and bone marrow transplantation. 3. Symptomatic treatment: 39 ℃ belongs to the high fever must be emergency fever, can be under the guidance of a physician oral ibuprofen suspension, with physical cooling methods to treat, need to bring down the child’s temperature, persistent high fever can easily lead to febrile convulsions (due to hyperthermia caused by convulsions convulsions), convulsions and even induced epilepsy. Parents are advised to bring their children to the hospital in time to clarify the cause of the disease. The above medication should be used under the guidance of a professional doctor.