One-month-old babies with green stools may be caused by hunger factor, medication factor, indigestion and other reasons. 1. Hunger factor: usually for one month baby, may appear hungry green stool, mainly because when the baby excessive hunger, the intestinal biliverdin can not be converted to bilirubin and excreted, so there will be the phenomenon of green stool. 2. Drug factors: not to exclude and drug factors, such as taking iron, iron will be metabolized in the body to form black-green iron sulfide, so a month the baby will appear to have a green stool phenomenon. 3. indigestion: generally if by improper care and lead to indigestion, in the case of the baby’s abdomen is cold, due to gastrointestinal peristalsis accelerated, the food in the case of not fully digested from the body, there will be the phenomenon of pulling the green stool. One-month baby green stool, there may also be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.