Years ago, my very young niece was experiencing constipation.
I made her a book to try and help. It had to be a book like no other she had seen. I wanted to explain a little about why it was important to poo as well as what happens to poo.
Sue the poo was invented. I even knitted a Sue the poo and made a Sue the poo song for my niece to sing when she was on loo.