We have a little throw pillow (about 10x10) that our daughter (17 mo) enjoys walking around with and laying down on if she is tired. Also, in the evenings, if she is slowing down and we are all lounging together, she will pull a pillow off the couch sometimes and lay down with us. That said, I wouldn't dream of putting a pillow in her crib with her, I don't think it is safe, and I also don't think it is best for her. her head is still big enough relative to her shoulders that she doesn't need that support in the same way we do, and clearly it would place her out of line on her back. I think that laying on Mommy is often a snuggly/closeness thing, and laying on pillow is copying us, not necessarily what she needs.