Most babies with high white blood cell counts are considered to be caused by bacterial infections, but it is generally recommended that a C-reactive protein test be performed at the same time to further verify whether the infection is bacterial or not. Laboratory tests can only be used as an auxiliary test to determine whether the baby has a disease and the severity of the disease, which should be based on the clinical manifestations. When the white blood cell count is elevated and accompanied by fever, tonsillar pus or localized pus, convulsions, and high fever that does not go away, it is necessary to go to the hospital promptly to find out the cause of the elevated white blood cell count, and to give the appropriate active anti-infective treatment. If the general condition is good and the white blood cell count is only found to be elevated in laboratory tests, the test can be repeated in a week.