I found this fun book recently and bought it because my grand daughter is enjoying books with flaps. Lifting them to see what is hidden beneath.
This flap book has many layers in one picture, as you can see with the turtle in the egg.
Her favourite picture in the book is of this nesting doll and finding a mouse hidden in the middle, under many flaps.
I dug out my nesting dolls from home, took out the smallest dolls and put in a mouse.
Then I gave it to her.
It took a bit of practice for her to be able to pull the doll apart.
She showed persistence in trying to do it
and joy when she found the mouse.
Out came the mouse,
and back together went the dolls.
I introduced sizing to her.
She already knows big and little so medium was a new word (and sign) for her.