It may be normal for a 12-year-old child to poop once every three days, or it may indicate abnormalities such as indigestion and constipation. If the child’s bowel movement process is relatively smooth, the color and shape of the discharged stool are not abnormal, and there are usually no symptoms of discomfort, then it may be normal. There is no need for concern or treatment. If the child has difficulty in defecation, dry stools and other symptoms, it may be a case of constipation. It may also be caused by indigestion due to poor eating habits, stress from school, etc. In addition, there are some diseases that may also cause the above symptoms, such as proctitis, intestinal obstruction, thyroid dysfunction and so on. In this case, you should consult a doctor in time and follow the doctor’s instructions for treatment. It is recommended to go to the hospital for examination and clarification if there are uncomfortable symptoms or symptoms persist for a long time without bowel movement.