6 months baby fart stinky reason and physiological factors, but also may and indigestion, constipation and other factors related to the specific analysis is as follows: 1. physiological factors: baby gastrointestinal development is not yet perfect, digestive function has not yet developed soundly, easy to cause intestinal peristalsis is not coordinated, causing intestinal flatulence leading to baby fart phenomenon. 2. indigestion: 6 months baby gastrointestinal digestion and absorption function is weak, to the baby to add complementary foods, excessive intake of protein and fat content of food, easy to appear indigestion phenomenon, resulting in smelly farts. 3. constipation: baby constipation is mostly related to diet, appearing hard and dry stool defecation difficulties, food in the intestinal tract stays for a long time, resulting in increased intestinal gas intestinal flatulence, the baby will let go of stinky farts. Cause 6 months baby fart odor may also have other reasons, it is recommended to timely to the hospital for relevant examination, clear cause of the disease after active symptomatic treatment.