The color of feces is related to the chemical change of bile. In the upper part of the small intestine due to the role of bilirubin and biliverdin, so yellow-green; to the colon when the biliverdin reduced to bilirubin, and yellow. The reasons for green stool may be the following: 1, newborns are born from the black meconium gradually converted to dark green, green, yellow, which is a normal phenomenon. 2, breast-fed children’s stool is acidic, due to the oxidative bacterial effect of bilirubin into bilirubin, so breast-fed children’s stool is slightly green is normal. 3, formula-fed children’s stools are alkaline and can be further reduced to colorless fecal bilirubin, so the stool color is lighter. If the formula-fed child excretes green stool, it means that the intestinal peristalsis is accelerated, suggesting that the child’s digestive function is poor, you can take some oral medication to adjust the gastrointestinal tract (such as Mamia, etc.). 4, eating iron formula baby, if not completely absorbed in the formula iron, these iron through the digestive tract, after contact with the air, the stool will appear green. 5.The amount of stool is small, more frequent and green mucus-like. This situation is often caused by inadequate feeding, this stool is also known as “starvation stool”. As long as you give adequate feeding, the stool can be turned into normal. In conclusion, green stools in babies are related to personal constitution, age, intestinal pH, intestinal bacterial growth status, dairy products (such as iron), as long as the baby’s spirit and activities are normal, there is no need to worry.