What is the reason why the little girl farted so badly?

The little girl fart is very smelly may be caused by gastrointestinal dysfunction, usually may not be hygienic diet or overeating for a long time, will lead to gastrointestinal dysfunction, slow down the speed of gastrointestinal motility, so it will lead to stool excretion is not smooth. And part of the food is not filtered by bile, accumulated in the intestinal flora fermentation. Produce a lot of gas, directly discharged from the body, will cause exhaust is very smelly phenomenon.