Two-year-old babies with green stools do not need special treatment, but only close observation. The color of the stool is related to the chemical change of the bile contained in it. The bile in the upper part of the small intestine contains bilirubin and biliverdin, which makes the stool yellowish green, and when the stool reaches the colon, the biliverdin is reduced to bilirubin by the bacteria in it, and the stool turns yellow. Breastfed babies have acidic stools, which can be oxidized to biliverdin by oxidizing bacteria, making the stools slightly green. Formula-fed babies have alkaline stools, which can reduce bilirubin to colorless fecal bilirubin, so the color of the stool is lighter. If a formula-fed baby has green stools, it means that intestinal peristalsis is accelerated or there is inflammation in the intestines, and diarrhea may occur.