Having a baby with low white blood cells after a fever can have serious consequences. The first thing to understand is that white blood cells are the immune cells in our body that help us destroy germs in our body, so when your baby has a fever, the white blood cells will fight the bacteria in your body to keep your baby healthy. If the white blood cells are defeated by bacteria or viruses, it will cause the white blood cells to drop. Due to the decrease in white blood cells, the baby will have symptoms of infection: high fever, chills, headache, dizziness, loss of appetite, nausea, vomiting, etc. 1. Consequences of lowered white blood cells caused by viral infections: With lowered white blood cells, some children can develop symptoms of acute upper respiratory viral infections or high fevers that do not go away, which in turn can cause pneumonia. It can also cause a decrease in autoimmunity. If a proper diet is not taken care of, symptoms of gastrointestinal discomfort, nausea and vomiting may occur. There may also be headaches, dizziness, and even serious complications, some of which may be combined with encephalitis. 2. Caused by primary illness or adverse drug reactions, some babies have prolonged fever and reduced blood leukocytes. Even if antiviral treatment or anti-infection treatment is given, the effect is still not obvious, which requires consideration of whether the baby is combined with blood system diseases, such as aplastic anemia, acute leukemia, etc. This is when the patient may present with symptoms such as secondary infection, bleeding or severe anemia. The application of some drugs may also cause a decrease in white blood cells. If the decrease is caused by adverse drug reactions, the treatment plan needs to be adjusted promptly. Therefore, if your child has low white blood cells, you must go to the hospital and follow the doctor’s advice, give the appropriate tests, and eat a reasonable diet to avoid further discomfort.