My DS is only 7 months, so doesnt have a pillow yet...but I just wanted to post an idea that I had from reading this thread.
I am going to buy a flat baby pillow before he needs it and put it in my bed so that when DS is ready for a pillow it will have my scent, maybe will help him sleep better in his cot as he gets a big bigger, he is not sleeping through yet and we co-sleep most the night.