I had "Your Pregnancy Week by Week":
http://www.amazon.co.uk/Your-Pregnan.../dp/0751336823
Excellent book, explains everything really well and it's dorling kindersley.. all their books are lovely.
Shop around, you might find a better price.
Oh sorry, just noticed you said baby.. do you not mean pregnancy then? or all types of baby books.
The little contented book of feeding (or something similar) is really great too.