Four-month-old babies eating milk powder has been green stool may be due to indigestion, gastroenteritis and other diseases, may need medication and other treatments. 1. indigestion: indigestion due to dysbiosis, lack of exercise and other reasons, may appear green stools, it is recommended to pay attention to dietary adjustments, small meals to avoid eating too much at a time; can take probiotics and other medications to regulate, such as clostridium typhimurium bifidus live bacterial powder, bacillus subtilis bifidus live bacterial granules, and so on. 2. Gastroenteritis: it may also cause the child to have green stool symptoms, parents can give the child a hot compress and massage the abdomen, oral bifidobacteria and other probiotics to improve intestinal function, so as to relieve the symptoms of green stool. If bacterial infection is present, anti-infective treatment with ceftazidime and ceftriaxone can be prescribed by the doctor. All of the above drugs should be used under the guidance of the doctor, avoid self-medication. When your baby has green stools for a long time without relief or other discomforts, you need to consult a doctor in time to get a clear diagnosis, and then a specialist will carry out targeted treatment or therapy.