A 6-year-old baby with a sudden fever at night needs to be treated with a choice of physical cooling and oral antipyretic medication depending on the degree of the child’s elevated temperature. And for the cause of fever treatment. For fever but body temperature <38.5 ℃ 6-year-old baby can use warm water on the child's forehead, reduce the wearing of clothing and other physical methods of cooling, encourage the child to drink more water, some children's body temperature can gradually decline; for the temperature ≥ 38.5 ℃ and accompanied by obvious symptoms of discomfort of children also need to use antipyretic drugs such as ibuprofen, acetaminophen and other antipyretic treatment under the guidance of a doctor. At the same time for the cause of the treatment is also very important for the recovery of body temperature, such as bacterial infection caused by respiratory tract infection, need to actively use antibacterial drugs such as cefaclor, cefdinir and other anti-infective treatment. Mycoplasma pneumoniae infection can be treated with azithromycin and other macrolide antibiotics. All of the above medications should be used under doctor's supervision and avoid self-medication. There are many causes of fever in 6-year-old children, and it is recommended to consult a doctor in time to be evaluated and treated by a specialist.