N.P.
Hi Stephanie,
Yeah, it's amazing how a child can go from completely potty trained, then to pooping in their pants.
Some will say it is due to constipation, painful poops, etc... but truthfully, my son didn't have anything like that and he had the same behavior. He was embarrassed by it, and cried with each "accident" due to the sorrow, so I knew he couldn't handle me getting upset with him.
I decided to have him help me clean him, and showed him the "right way" (without backing up the toilet). I made one of the bathroom cupboards contained with every item needed just for this emergency.
After a few times of helping him, I then told him that it was his turn to clean himself. I told him that he was 4, and getting ready to go to the big school, it was tme he learned how to take care of himself. So, with every ounce of will-power, I did not help him clean himself. Amazing, he didn't cry for me to help him, because he KNEW he was big enough to handle this situation.
After a few times cleaning himself, then it began to stop. Sure there would be a little accident from "waiting too long", but that was nothing!
Try not to show anger or frustration, and you should move through it pretty quickly :O)
Good Luck!
~N. :O)