Children with fever after vaccination can be physically cooled down without special treatment, as long as the fever is not too high and the child is in good spirits. However, in some special cases, if the fever is relatively high, it should still be treated with antipyretic medication. Especially for younger children, high fever convulsions can easily occur, so timely fever reduction is needed. For children over six years old, fever suppositories can be inserted into the anus to reduce fever. For children under six years of age, oral ibuprofen suspension or acetaminophen pellets are recommended to reduce fever. In addition, vaccines are often inactivated viruses, bacteria or toxoid, and often inactivated viruses are more common. The cause of the fever and the type of infection need to be treated symptomatically by choosing the appropriate medication according to the doctor’s judgment, and blood tests and C-reactive protein should be performed if necessary. If the infection is bacterial, antibacterial medications should be used, and if the infection is viral, antiviral medications should be chosen.