Okay, DS is 2.5 & has been potty trained during the day for over a month. He has never woken up from a nap or nighttime dry, so we've been using pull ups for naps & nighttime only. The past week or so he's been waiting to poop during nap time in his pull up. I really don't want this to become an issue...but at the same time I'm afraid to take away the pull up since he's never woken up dry. Thoughts or advice???