The causes of green poop in six-month-old babies may be indigestion, food-induced, acute gastroenteritis and so on. 1. indigestion: if the baby overfeeding, may easily cause gastrointestinal dysfunction, indigestion manifestation, in addition to the performance of green stools, may also be accompanied by vomiting, abdominal distension, eating less and other symptoms. 2. Food: six months baby if breastfeeding, stools green may be due to the mother’s diet to eat more iron-containing foods. Or the baby complementary food such as rice powder, formula milk in the iron content is too high and so on. These cases generally do not require special treatment. 3. Acute gastroenteritis: In addition to green stools, this disease can be accompanied by vomiting, abdominal distension, or even fever, and the stools may also be accompanied by mucus. This disease can be caused by viral or bacterial infections. Six-month-old babies may also have other causes of green poop, it is recommended to go to the hospital in time, complete the examination to determine the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.