This is THE most useful book you can buy as a first time parent.
It's a kind of Baby-bible really and I would suggest you buy it BEFORE junior arrives as it has lots of useful advice about what you need and what you'll be doing in the first weeks. (And lets face it you won't have time to read books in those early days...)
It's written like a list of FAQs for each month of baby's first year, but rather than presenting only one viewpoint or answer, it describes all current views on a subject, gives you the facts then lets you decide what's appropriate advice for YOU and YOUR baby.
Sometimes it's just enough to know that something you're experiencing is completely normal and has been experienced by other people. Sometimes you have questions that seem too trivial to bother the health visitor with so this book provides a useful back up.
It covers health topics, behaviour, and likely development stages for each month. A useful book for dads too - especially in the first few weeks when they can feel like they're reliant on the women-folk to know what's going on (don't know why - first time mums feel as clueless as everyone else at times!!).
The only down-side, and the reason I've only given the book 4 stars, is that it was obviously written for the American market but has been 'Anglified' and almost all of the examples have been re-written to cover English views/laws etc, however now and then you find a bit of the American lingo still hanging around. The examples are still useful though, but you just get a feel that they're not quite as relevant.