My 6 week old beamed the first time I showed her the puppy on the front cover, so I knew straight away this was a good buy. The black and white baby animals on each page hold a young baby's attention, especially those who are looking directly at the reader (a couple don't and my baby is not so interested in those) and it's lovely to see a such a small child staring intently at the pictures.
Babies can see high contrast (such as black and white) images best and enjoy looking at faces, so this book is perfect. I chose this book over one that contains human faces as these pictures are much cuter and have more difference between each image. As others have stated, the final image (of a baby looking at the same pictures that are in this book on her own cot mobile) is a clever, thoughtful twist that brings in narrative possibilities. Highly recommended - you'll love looking at it as much as your baby does and that is so important when encouraging a child to love reading.