I have only read a few posts but I have to jump in here. I didn't let my oldest daughter cry it out and at the age of 4 she still has trouble getting to sleep by herself. However I talked to a few people about letting a child cry it out and the right way to do it and I tried it with my younger daughter and she goes to bed on her own almost every night started sleeping through the night younger than a year and still does. I would also like to add that my younger daughter is more affectionate than my older one, proving, at least to me, that violence has nothing to do with CIO. My youngest daughter is currently 21 months old.