If a child has a fever with elevated white blood cells and C-reactive protein, it may be related to bacterial infection or Mycoplasma pneumoniae infection. If the white blood cells and C-reactive protein are elevated during the fever, most of them may be related to Mycoplasma pneumoniae infection and bacterial infection, etc. And the above conditions usually occur repeatedly within three days, and the fever usually exceeds 38.5 ℃, and need to actively cooperate with the use of fever-reducing drugs, such as ibuprofen, acetaminophen. There are many causes of fever in children, it is recommended to consult a doctor in time in order to clarify the cause of the disease and standardize the treatment. All of the above medications are recommended to be taken under the guidance of a doctor and should not be used on their own.