If your baby has a fever of 38°C that does not go down, you can treat it with physical antipyretic therapy. It is also important to make a clear diagnosis early to avoid serious infectious diseases such as pneumonia. It is recommended to go to the hospital for chest X-ray or chest CT to determine if there is an infectious disease in the lungs, and also to test for mycoplasma antibodies and C-reactive protein and blood tests to determine if it is caused by a bacterial infection. If it is a common bacterial infection, you can use cephalosporin anti-inflammatory drugs continuously for about 5-7 days, and the fever can be controlled. If there is mycoplasma infection need to use azithromycin treatment for about 15 days, can make the condition basically controlled, must go to the hospital early to receive examination and treatment.