Both my 6 and 3 year old loved this book directly, even the first read turned into reading it 4 times. They loved that you have to 'do things' with the book - as different pages instruct shaking it, or rocking it. I liked how it sparked their imagination about what the crocodile (who escapes at the end) will get up to next.
One quite unique feature of this book, specifically for this age group, is that there are holes in it! There are quite a few books for 1-3 year olds with windows cut into them but from 3 on you're not really seeing that - it's almost like someone did the unthinkable and actually damaged it... one of the cheeky features of the book which they loved.