Secretly have every nurse/doctor (throughout hospitalization) sign this book, and give to your child as a surprise when they go home/are old enough to understand. Would be a great way to celebrate the end of treatment.

I’ve seen this idea for teachers from each of your child’s grades to fill out but I love that it was adapted for the hospital! What a neat gift whether from your child’s teachers or nurses/doctors. 

Source: http://asprinkleofthis.blogspot.com/2011/07/its-girl.html