Lmao.. Sorry i shouldnt laugh
I know its waterproof but if you soak it in warm/as hot as its safe for ur baby it might unstick because of the type of surface its on?
Or maybe a hairdryer to warm the sticky side glue and hopefully itl unstick a bit? Or if you can pour baby oil on the sticky side and it might come off bit by bit.. If that fails try butter or peanut butter and smother it onto the sticky side and it might unstick bit by bit.
Good luck.. And PLEASE can we have a picture lol xx