My son received this when he was 3 months old or so. At first he simply held it to look at his reflection in the mirror (a very good mirror by childrens book standards - it doesn't have the "crazy mirror" feel many others have) though he soon got into turning the pages and chewing on it, which is where this book came into it's own. I was sick of looking at board books with teeth marks in them. All this needs is a quick wash at night and viola, you're ready for the next day.
One simple, but often overlooked feature is the book is the velcro tag. You can attach it to cot bars or pushchairs or.. anything, really.
The pages are very simple. There are three black and white images of animals (the same seen on the front cover) with the names written beneath, and three black/white/red patterns. They're quite simple images but hold babies interest for quite some time.