The green stool is probably the color of fruits and vegetables, or the stool with gastroduodenal bleeding is dark black and dark green. Biliary diseases (bile excretion disorders) will make the stool lighter rather than yellow. You can observe whether the eyes and palms turn yellow. If there is any color change, please consult a gastroenterologist for diagnosis.
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Many infants excrete green stools, which is not a sick baby, but a normal physiological phenomenon. The color of stool is closely related to the chemical changes of bile. Bile is secreted by the liver. Hepatocytes constantly secrete bile, which flows into the hepatic duct and then enters the duodenum through the common bile duct. The color of bile is related to the type and concentration of bile pigment, which can range from golden yellow to dark green. Bile pigments include bilirubin and biliverdin, which can be transformed into each other.
Bile in the upper part of the small intestine contains bilirubin and biliverdin, which makes the stool yellow-green. When the stool is pushed to the colon, biliverdin is reduced to bilirubin, and then the stool is yellow. Breast-fed children have acidic stools. Under the action of intestinal bacteria, part of bilirubin is converted into biliverdin, which makes the discharged feces light green. This is a normal phenomenon, and the feces of breast-fed children are alkaline, which can further convert some fecal bilirubin into fecal bile. The feces are colorless, so the feces are pale yellow.