Hello I had gone through your question diligently and I will try to help you out in best possible way gas in abdomen and loose stools can be caused by food poisoning, gastroenteritis, colitis or worm infestation and intestinal hypermotility I would like further information to help you better like his age frequency of stools or whether it is associated with bleeding? In my opinion you should consult your doctor for examination and stool test for ova cyst or parasite You may require a course of antibiotics like tinidazole or metronidazole and probiotics meanwhile try to observe good hygiene wash his hands with antiseptic soap or solution after using wash room give him plenty of fluids including ORS to avoid dehydration and electrolyte imbalances have lots of fresh fruits and vegetables or dietary fibers Hope this answers your question Best wishes