My little girl Emily has always been a rotten sleeper, I used cc to get her to go down to sleep in the evenings, which worked quite well. She is now 19 months and was up until two weeks ago waking up around 6 times per night for a bottle of milk/juice to get her back to sleep. I decided this was rediculous I new two new borns that were sleeping through better than that.
So one night I decided to ignore her, because because she needed to learn and must have been suffering from sleep deprivation. By the four night she was sleeping through from 7.00pm til 7.00am, fab!
She does still occasionally wake but I don't go in, unless I think somethings really is up, and after a few minuets at most she settles off again. Its litterally just some moans not the full out screaming she used to do. I'm sure she feels better for the good nights sleep, I certainly do!
I know some babies are sick if they get upset so it may not be so easy if that is the case, but its worked for me.
Once you'v decided on it, stick to it.
It seems cruel but I think its important that they learn to self sooth. It sets for better sleep later in life.