Sudden green poop may be caused by the consumption of green food or iron-containing food, medication and other physiological conditions, as well as gastrointestinal tract abnormalities and other pathological conditions. Sudden green poop may be caused by the baby’s recent consumption of green food, such as green vegetables, or the baby ate more iron-containing medicines or iron-containing foods, such as chicken blood, duck blood, and so on, which can also cause the baby to suddenly have green poop. If due to improper diet or improper care, there may be digestive disorders or gastrointestinal infections and other diseases, can also lead to sudden green poop, usually accompanied by vomiting, diarrhea and other symptoms. There may also be other causes of sudden green poop in babies, so it is recommended to go to the hospital in time for a complete examination to determine the cause of the problem, and then give targeted treatment under the guidance of the doctor.