If a 3.5 year old child has a fever, different treatments are needed depending on the degree of the fever and the cause of the fever.1. To relieve the symptoms of fever, if the child’s body temperature is below 38.5℃, and the child hasn’t suffered from febrile convulsions in the past, it is recommended that the child should be cooled down physically by applying antipyretic patches or taking a warm bath.2. If the temperature exceeds 38.5℃, the child can take antipyretic drugs such as ibuprofen granules. If the body temperature exceeds 38.5 ℃, you can take antipyretic and analgesic drugs such as ibuprofen granules to lower the temperature. 2, if the child’s fever is caused by bacterial infection in the body, you can take azithromycin granules and other antibiotics against the cause of treatment, from the root to treat the causes of the child’s fever. 3, if the child is due to a cold caused by the fever, and accompanied by a runny nose, sneezing, etc., you can take aminophenol xanthin granules for treatment. If the child’s fever is caused by a cold with a runny nose and sneezing, he or she can take aminophenol xanthin granules.