There Are Cats in This Book, by Vivienne Schwartz

This is a fabulously engaging book - you are introduced to the 3 cats at the start and help them by turning the pages to get to wool, cardboard boxes, fish. The cats are different sizes, enabling you to do 3 distinct voices and thank you for helping. The illustrations are gorgeous and my (now 5 year old) and my 1 year old both adore it.