Four Year Old Vomited Once. He Ate A Little And

Four year old vomited once. He ate a little and drank fluids. He had foul smelling gas after. The next day he was fine at 31 hours later he vomited again once. He again has foul smelling gas. He says his stomach doesn't hurt and shows no other symptoms. He pee is still lite in color and he has solid BMs.