My daughter is almost 10 months and was the same exact way. I just got her to lay down herself for her full nap not even a month ago.
Rock her to sleep&lay her down for her nap. If she wakes up, go right back to rocking her. The first week of us doing this it took my DD about 5-6 times sometimes to actually lay down and go to sleep. Eventually she will wear out and stay asleep. (My DD also sleeps best during naptime on her belly) If she wakes up in the middle of her nap, rock her again, and lay her back down. My DD has now realized that she will sleep in her crib during naptime and will take 2 hour naps and I only have to lay her down once. Sometimes she wakes up in the middle of her nap, but I just rock her back to sleep.
You do not have to use the CIO method to teach your LO to sleep by themselves. Nor do I see a reason for a 9 month old to have to learn to put themselves to sleep. When my DD reaches about 1 1/2-2 then she will start learning to fall asleep on her own.
at 5:29 PM on Jun. 19, 2008