I tell you what, my little girl (who is now 3 and 85% potty trained), wouldn't keep her diaper on for anything! Duct tape? Ha! She would just shimmy the diaper down, right off her body. I tried Onesies...she also shimmied those down her body. She'd stretch out the neck, and wiggle her arms out, then the rest of it came right off. She was (and still is) quite the Houdini! So sometimes, trying to get them to keep the diaper on, is a huge issue. Anyways, as far as cleaning the urine smell out of her pillow, is it down? If it's not a down pillow, just throw it in the wash with some bleach or color-safe bleach & a good detergent. If it needs spot cleaned, try a pet stain & odor remover. Good luck with the potty training, sometimes it can be a loooong, drawn out process. :)