Low white blood cells in babies with fever are considered to be caused by viral infections, which can usually be cured in 3 to 10 days. For babies with fever caused by viral infections, low white blood cell counts may appear during medical checkups, and the fever will usually clear up in 3 to 10 days. If the baby is in good health and the parents pay attention to care, the fever usually resolves in about 3 days. However, for some babies with severe viral infections and poor physical condition, the fever and low white blood cell count may resolve in about 10 days. For babies with low white blood cell fever, parents can place antipyretic patches on the head, warm water baths and other physical means to promote the return of body temperature to normal. If the physical cooling effect is not satisfactory, or the temperature exceeds 38.5 degrees, you can follow the doctor’s advice with ibuprofen, acetaminophen and other non-steroidal anti-inflammatory drugs to reduce fever. If your baby’s white blood cells are low, it is recommended that you consult a doctor for a further detailed examination to determine the cause of the illness and then follow the doctor’s instructions for treatment, and do not use drugs or prescriptions indiscriminately.