This is my 3rd baby and worst sleeper by far. I did CIO with my second child. He would put his self to sleep but didn't sttn till 15 months. Dd is 4.5 months and a terrible sleeper. I'm not even looking for sttn, just a little better. She wakes every 2 hours. I do not feed her every time. She won't sleep at all in her crib. She sleeps either in the rnp or with me ( out of desperation). She goes from zero to 60 quick if you don't respond to her ( so CIO makes me nervous). So tell me what method you used and why you liked it?