Sudden green poop may be related to dietary factors, cold abdomen, gastrointestinal infections and so on. 1. Dietary factors: If the baby eats too much green vegetables or dark-colored food, it is possible that the baby will suddenly poop green. 2. Abdominal cold: when the baby in the night air-conditioning or wear less clothes, it is easy to cause abdominal cold, may lead to the baby suddenly pull the phenomenon of green poop. 3. gastrointestinal tract infection: if the baby’s body resistance is poor, it will easily lead to bacteria or viruses invade the body, resulting in gastrointestinal tract infection, the baby suddenly pull green poop situation. After excluding dietary factors, parents should take their babies to the hospital in a timely manner to clarify the cause and follow the doctor’s instructions for treatment.