Bacterial infections in children are caused by a variety of reasons, such as bacteria in the air and food, low autoimmunity, and lack of attention to personal hygiene. 1. Bacteria in the air, which enter the body with the child’s breathing, can easily cause respiratory infections when the child’s immunity is low. If the child eats spoiled or improperly handled food, or if the child does not wash his/her hands before eating, bacteria can enter the child’s body with the food and cause gastrointestinal infections. 2. Children’s immune function is not yet fully developed, the child and the bacterial group contact, can not resist the invasion of bacteria, may lead to children’s infections. 3. Children do not pay attention to their own hygiene and cleanliness, which can lead to the localization of bacteria in the body, which can lead to bacterial infections in children. Therefore, parents should pay attention to their children’s dietary hygiene and personal hygiene, let the children do more exercise, eat more vegetables and fruits, etc., which can help enhance the children’s own resistance to avoid bacterial infection.