While it appears a good idea, a water-proof book for babies to use in the bath I cannot see what age group the 'baby book' is for.
I have a six month old and she really does not take much notice of it in the bath.
When given the book to look at she generally tries to eat it.
The book, when new, smells strongly of plastic, and should be aired thoroughly.
My other concern is over the type of plastic used in the manufacture. While I am sure it is a safe 'toy' now, science changes. I only say this when I refer to the fact that babies put everything in their mouths.
Older 'babies' will probably want to play with other things in the bath, mainly things that splash water. My son aged 4 thought the sucker pad was good then lost interest.
Visually it is not bad, the pictures draw the eye, the mirror is shiny and fun.
Is it a toy? a book? a development aid?
In principle a good idea, but a lot of good ideas fail in their application.