Fever in babies is mostly caused by infections, and blood will be drawn in the hospital for routine blood tests to determine whether it is a bacterial infection or a viral infection through the values of white blood cells, neutrophils and lymphocytes. The following reasons are considered for babies with fever but normal white blood cells: 1. Bacterial infection, bacterial infection will suggest that white blood cells are elevated, but in the early stage of fever, white blood cells may not be elevated, but only the number of neutrophils or the proportion of neutrophils is elevated, and the white blood cells may be elevated in the later stage when the routine blood test is reviewed again. 2. Antibiotics have been applied to fever, and the white blood cells will be shown to be normal. 3. Viral infections, such as influenza, will result in a normal white blood cell count. For example, in influenza, the white blood cells will be normal, but the proportion of lymphocytes or the number of lymphocytes will be elevated. In this case, it is not suitable to take antibiotics, but you can take antiviral or heat and toxin eliminating Chinese medicines.