A 5-week-old child with a fever that does not go away for 4 days should be given a prompt decongestive treatment. The cause should also be identified for targeted treatment. The most common causes are bacterial infection, viral infection and mycoplasma infection. In the process of recurrent fever, when the temperature exceeds 38.5 degrees Celsius, ibuprofen or acetaminophen antipyretic drugs should be given as prescribed by the doctor in a timely manner. If the temperature is lower than 38.5 degrees can be given physical cooling, with a warm towel to wipe the armpits, forehead, groin and other parts of the body to help dissipate fever. Fever has been recurring for 4 days, mostly due to infections. Bacterial infections can be treated with antibiotics such as cefixime. If it is caused by influenza virus, antiviral drugs such as oseltamivir can be used. If it is a mycoplasma infection, it needs to be treated with azithromycin and so on. A 5-year-old child with fever for 4 days may also have other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.