The greenish color of baby’s stool may be due to a cold abdomen, gastrointestinal infection or physiological factors. 1. Cold abdomen: If the baby is not covered properly when blowing the air-conditioner at night, or wearing less clothes in daily life, there will be a cold abdomen, which may be manifested as greenish stools. 2. Gastrointestinal infection: If your baby eats food that is infected by bacteria or viruses, he may develop gastrointestinal infection, which may trigger the green color of his stool. 3. Physiological factors: If the baby’s body is normal, only the stool appears green, may be due to the day before eating vegetables and other complementary food, the situation is normal, no need to deal with. If your baby has green stools, it is recommended that you observe closely, seek medical attention for any abnormalities, and follow the doctor’s instructions for symptomatic intervention.