A recent Harvard Medical School study reports that letting your baby "cry it out" can cause brain damage! The authors of this study say that parents should respond to their infant's cries quickly, keep them close to them and they also advocate co-sleeping with parents.
I have to admit that before I became a parent I sometimes gave out some unsolicited parenting advice (sorry to you recipients of that) and that having a baby of my own has definitely changed a lot of my ideas about parenting. First of all I think that parents just have to do what works for them. It is a lot easier to give advice about how to raise a kid than it is to follow it ;) .
before Lily, I was pretty much in the anti-cosleeping camp. I thought it would be hard on the parents' relationship etc... Now we practice cosleeping with Lily (with her cosleeping bed) and I can't imagine not doing so. I think sleeping together feels more natural and also makes all of us feel more secure.
I also used to think it was ok to let a baby cry it out :) it is kinda funny to me now that I think about the fact that in Lily's nearly 4 weeks of life she has never cried unattended (unheld and uncomforted) for more than like 30 seconds.
Admittedly she is not a crier anyway, but I have found that I really cannot stand it when she does cry. It stresses me out and makes me very nervous... so I get to her right away and luckily she calms down easily.
Now that I see this study I'm glad that I am already sleeping next to her and attending to her cries. Whether or not the study is right I'd have to say that taking care of her and not letting her just cry instinctively feels right and I'm pretty sure it can not harm her as much as letting her cry might.