The most likely side effects of antibiotics in children are dysbiosis and lowered immunity. You can give your child probiotic drugs for a period of time, such as Saccharomyces boulardii, Clostridium typhimurium, Tetrahymena, and Mamma’s Anatomy, which can regulate the flora in the body and prevent dysbiosis. Take medicines to improve immunity, commonly used are transfer factor oral liquid, splenamine-based oral lyophilized powder, Sophora yellow granules, etc. It is important to have a reasonable diet, strengthen exercise, keep indoor air circulation, try not to take children to shopping malls, supermarkets and other densely populated environments with poor air circulation, also reduce contact with sick children, and vaccinate on time to prevent reoccurrence of infection.