My 3 year old son passed mucus last night. He thought he had diarrahea and said he had to go. Once on the toilet he pushed out a white cloudy mucus. He just recently has had trouble with bowel movements. He has one a day, sometimes 2 but he always say they hurt him. He tries to avoid going to the bathroom because he says it hurts so bad. The bowel movements are hard and very large in size.