Each one is adorable. I vote for cotton batting. Thanks for sharing and I wish you great success with your venture.

What a delightful peek-a-boo soft, brightly colored, easily identified objects, counting, movement, colors, a real hands on book for children!
It has things small children like, food and animals, things that go, it will generate much conversation between the children as they explore it. What a lot of fun you created! A lovely interactive storybook.

Very cute!!! :)