The baby temperature of 38.5 degrees belongs to the fever, caused by the baby fever has many reasons, such as viral infection, bacterial infection, mycoplasma infection, etc., need to go to the hospital in a timely manner to the doctor, clear the cause of the disease, in accordance with the doctor’s instructions to take physical therapy, medication, and other ways, to treatment. 1. Physical therapy: parents can place the child in a quiet environment, air circulation, and appropriate clothing to avoid covering the sweating quilt, in addition, the child’s family can use warm towels, wipe the child’s head, neck, groin and other large blood vessels, in order to facilitate heat dissipation and cooling. 2. Medication: (1) Antipyretic drugs: If physical cooling does not relieve the child, the child can also follow the doctor’s instructions to use acetaminophen, ibuprofen and other drugs, to lower the temperature. (2) anti-infective drugs: if the fever caused by viral infection, you can use anti-viral oral solution and other anti-viral drugs; if the fever caused by bacterial infection, you can use cefaclor, amoxicillin and other antibiotics; if the fever caused by mycoplasma infection, you can use azithromycin and other drugs. In addition, there are many other reasons that can cause fever in babies, it is recommended to go to the hospital in time to clarify the cause of fever and receive treatment as soon as possible so as not to delay the condition.