If children are infected with H. pylori, they will have the following clinical symptoms: First, they will have bad breath. H. pylori infection in children can cause bad taste in the mouth and poor digestion. Secondly, they may experience pain in the stomach. After children are infected with H. pylori, it will cause gastric ulcer and chronic gastritis and other symptoms, which will cause children to have stomach pain. Again, it can cause a decrease in the digestive function of children. Infection with H. pylori can cause poor appetite for meals and symptoms such as bloating and vomiting, so children should be given timely anti-H. pylori infection, such as the application of omeprazole, amoxicillin, clarithromycin and other medications.