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What should i do about my sons' excessive gas? - excessive gas more condition_symptoms

My son has a problem with excess gas. As he sits at his desk in the school means that wind. My son is in, he felt and heard a thud. He is in full before their colleagues in embarrassment. What you should do, because I do not want to go to school. Please help and tell me what to do to try to get that gas to stop. It was very distracted at school and grades suffer. He said if it feels better standing and goes. I do not understand why it does sit. Thanks