My daughter has complained of stomach pain (ranging from just mentioning, mom, my tummy hurts, to not being able to walk due to the pain and thus a trip to the ER. She is 4 1/2 years old and had 2 x-rays in the past 3 months of her abdomen, of which both show a large amount of stool. She has regular bowel movements, sometimes 2-3 times/day. On both occassions, the Dr. has said she is constipated and to give her miralax. I am hesitent to continue giving it to her since she isn't having problems having a BM, and the label makes it seem like it is to produce a BM. What are some other causes of having stool backed up in a child when they do have regular BMs.