If a four-month-old baby has green stools, it is usually considered to be caused by dietary factors, indigestion or gastroenteritis, and other factors, and it is necessary to give the baby appropriate drugs to adjust the gastrointestinal tract environment. After, or bilirubin reacts with lactose, it will lead to green stools and this kind of situation; 2, indigestion: because the baby’s gastrointestinal tract function is not yet perfect or the abdomen is cold, it may lead to indigestion and green stools. You can give your child probiotics, adjust the intestinal flora, and pay attention to the baby’s abdomen warmth, you can also appropriate hot compress abdomen; 3, gastroenteritis: gastrointestinal tract inflammation, in addition to green stool may be with mucus or blood, you need to go to the hospital in a timely manner, under the guidance of doctors to take montelukast, domperidone and other drugs for symptomatic treatment.