My 19month old son loves this book. He always wants to read it. I think he understands Tiny Potty more, but it is at least getting him familiar with the idea of waking to pee. I love the simplicity of it, even if some things are different to our situation, like my son is in a crib and there is not a potty in his room.
This book helped my little one stop wetting the bed at night Love all your products!!