Four-year-old baby fever but normal mental state can be seen in respiratory diseases, urinary tract diseases, etc., need to be treated according to the cause of the disease; at the same time, need to actively carry out antipyretic treatment, according to the degree of elevated body temperature to choose physical cooling or oral medication. Fever is a common symptom of childhood, for 4-year-old baby fever but body temperature <38.5 ℃ can use warm water on the forehead, reduce the clothing worn by the physical methods of cooling, encourage children to drink more water, some children's body temperature can gradually decline; when the body temperature ≥ 38.5 ℃ also need to use antipyretic drugs under the guidance of a doctor, such as ibuprofen, acetaminophen, and so on. For the cause of the treatment for temperature recovery is also very important, such as for viral infections caused by respiratory disease, four-year-old baby can use four seasons of antiviral combination of drugs such as treatment; for bacterial infections caused by respiratory or urinary system diseases need to be based on bacterial culture and drug sensitivity test to choose sensitive antibiotics, such as penicillin, ceftazidime and other drugs for treatment. For other diseases, such as acute leukemia, the above phenomenon may also appear in the early stage of the disease, accompanied by bleeding spots on the skin and mucous membranes, etc. The diagnosis is clear and active chemotherapy should be carried out, and the commonly used drugs include cyclophosphamide, vincristine, etc. Bone marrow transplantation can be carried out if necessary. All of the above drugs should be used under the guidance of doctors, avoid self-medication. There are many other causes of fever in four-year-old babies, and it is recommended to actively consult a doctor and be evaluated and treated by a specialist.