I found this book really useful. A friend gave me a copy when my baby was 8 weeks and after reading it I wished I'd had it from week 1! What I liked best is that it clearly explains just how varied the habits and behaviours of babies are, so you can be reassured that what your baby is doing is normal - not like some other books which can be very strict about things like sleep/feed times. I also loved that it explained changes in baby's behaviours so I was prepared for them and knew what to expect. I'm a bit confused about other comments about CIO. I actually found the advice about learning the difference between 'real' crying as opposed to self soothing sounds really valuable as it stopped me from disturbing my little one by picking them up when they were just about to drop off (which I'd done before I read the book). I didn't interpret the advice as leaving the baby to cry until they vomit......It clearly says that you only leave the baby to 'cry' once you are confident there is nothing wrong with the baby, and to learn to recognise the difference between the constant crying of a baby who is in pain/hungry to that of a baby who is self soothing. It also advises how to avoid your baby becoming over tired and to establish good sleep habits (while also staying flexible which is important for both baby and for mums who don't want to be restricted by overly strict "schedules"). I have since bought this book for friends who also found it excellent.
Absolutely shocking and disturbing! The advice giving is cruel and unnecessary! Leaving your child to scream and cry until they vomit and then not look at them or talk to them while you change their sheets is just a form or child abuse as far as I'm concerned. Very little research has gone into this book. Please do not buy this book or follow any advice from CIO!