Your baby is too young for this. He still needs to be with you. No "blankie" can possibly take the place of a warm, loving, responsive human parent. I'm really surprised that you put that in his crib and then walked away. Dangerous!
"Sleep training" is a crock. Human babies don't need to be *trained* to sleep, they do it just fine if nursed, cuddled or worn in a carrier to sleep. Babies have evolved through millennia to become scared and upset if left alone, and rightly so. In the past, this could have left them prey to wild animals, lost or abandoned. A hearty piercing cry upon finding itself alone has probably saved many a baby's life.
I always laid with my now 4yo son to get him to sleep. I cuddled or nursed him, sang songs, and then slipped out once he was deep in slumber. Yes, he became used to my comforting presence. No, I didn't *always* feel like staying with him until he fell asleep. But this time in a mother's life is very short, and I never felt it was acceptable to let my baby cry and feel abandoned.
Today he routinely sleeps 12 hours straight. He is not afraid to go to bed, or sleep in his room by himself. He never fights going to sleep, he looks forward to it.
I also have a 1yo baby boy, and he sleeps 12 hours a night with me, naps wonderfully well, and is happy and healthy. I have never done any form of "sleep training" with him, I just make sure that he knows that I am there for him and responsive whenever he needs me. If he wakes and cries, I go to him and nurse him or pat him back to sleep.
I don't expect him to be able to fall asleep without me for another year or so. That's just not how most babies work.
Research done at Harvard University bears out my instinctual feeling about this:
http://www.hno.harvard.edu/gazette/1998/04.09/ChildrenNee...
<i>Instead of letting infants cry, American parents should keep their babies close, console them when they cry, and bring them to bed with them, where they'll feel safe, according to Michael L. Commons and Patrice M. Miller, researchers at the Medical School's Department of Psychiatry.
The pair examined childrearing practices here and in other cultures and say the widespread American practice of putting babies in separate beds -- even separate rooms -- and not responding quickly to their cries may lead to incidents of post-traumatic stress and panic disorders when these children reach adulthood.
The early stress resulting from separation causes changes in infant brains that makes future adults more susceptible to stress in their lives, say Commons and Miller.</i>
So please, reconsider your plan for "sleep training". Just be with your wonderful baby and enjoy the time. It passes quickly.