We started CC with 6 month old DS two night ago. We had genuinely tried every other approach but softly, softly doesn't work for some babies, especially stubborn souls who just want company and interaction 24/7.
It took a lot to get us to the point where we even considered using it: 10 weeks of 4 hours sleep in 24; 15 weeks of bottle refusal; no daytime naps; multiple night wake ups, some lasting up to 6 hours; meltdowns every time we went into his room etc. we tried shhhh/pat and PUPD but this just enraged him as because he could see us he thought it was time to play/have a chat/bounce and could not resettle.
We can't feed to sleep due to his bottle refusal so we decided that he had to either concede to taking it or learn to sleep when hungry. He has opted for the latter.
We're only on day 2 of modified CC (I couldn't take his dmy away too-felt it was too much, too soon) and-touch wood-there's been a marked improvement in his sleep.
First night was awful. He woke at 4 and didn't go back to sleep until 620. Naps were a bit better but only because he was so tired.
Last night was great. He slept from 730-515 (with yogurt DF) before he called out for his dummy. I was in and out in 2minutes. Started grizzling at 545 but he didn't even get to 5m before he had put himself back to sleep.
Today's naps have been amazing. DS did 2 x 90m naps (this is unheard of). First was without a fight; second he cried for about 10-15m before dropping off (had to replace dummy twice). He also had a 20m power nap late afternoon.
Went down without so much as a whimper at 730 tonight and -so far-he's not made a sound.
I'm not by any means saying that CC is the right route for every child. DS is highly strung, had endless and boundless energy and loves interaction. We learned fairly early on that our presence on his room just wound him up. Remove the distraction and he could concentrate on sleeping. I honestly think that he needs to cry to get rid of his excess energy/frustration.
He was completely ready for it. If he was more sensitive (he's a right wee bruiser) I would probably have persisted with gradual retreat.
Please don't be put off trying it. If it isn't for you or you think your DC isn't ready, you can stop. Every child is different and there is no "one size fits all" approach. If you've tried everything else, you've nothing to lose.