Children with fever of 39°C are associated with acute respiratory inflammation, pneumonia and other diseases. 39°C is already a high fever and this condition should be promptly treated with medication and given antipyretic treatment. You can consider timely injection of Chai Hu injection for fever reduction; you can also consider taking ibuprofen suspension for fever reduction treatment. Acetaminophen suppositories can be inserted in the anus to reduce fever. During the treatment period, you should also pay attention to closely observe whether the child has reactions such as unresponsiveness, spasms of the limbs, impaired consciousness, etc. Once such cases occur, you need to consider the high fever convulsions, to be given timely sedative and antispasmodic drugs to control. During the period of fever reduction, pay attention to wiping the neck, armpits, leg roots with warm water for about 10 minutes each time, which helps to dissipate heat and cool down. You also need to pay attention to keep the room clean and ventilated, dress generously and coolly to avoid excessive stuffiness, and try to control the room temperature at about 25℃. During fever, you also need to pay attention to ensure sufficient water intake to ensure that the body has enough water and energy.