Bacterial infections and fever in children are mainly caused by the following conditions: First, they are caused by children feeling wind and cold. If a child gets cold and blows, the evil of wind and cold will attack the child, causing a low immune system and easily causing bacterial infections, which will result in a higher fever and cough. Secondly, it is caused by cross-infection. If a child comes into contact with a patient who has a bacterial infection, the child can also feel the bacterial infection through cross-infection, which can cause symptoms such as fever. Finally, if a child eats unclean food, it can also cause bacterial infection, which can lead to symptoms of the digestive tract such as vomiting, abdominal pain and diarrhea.