What’s wrong with green poop in newborns? A. When the newborn is cold, hungry and eating improperly, the baby’s intestinal peristalsis will speed up, sometimes you can hear the stomach grumble, when the discharge of the stool is mostly green. Two, breast-fed baby stool is acidic, will be in the role of intestinal bacteria, bilirubin into biliverdin, sometimes the stool will be green. Third, some babies are anemic when supplemented with iron, this time the baby’s stool will also be green. If the baby is not in good spirits, there is mucus, pus, blood in the stool or obvious watery stool, this situation needs to be taken seriously and stool specimens should be taken for further laboratory tests.