I've wondered about this as well (sorry, not a helpful answer
). When my 9 month old would sleep in my bed when she was younger and teething terribly, she would cuddle right up to the pillow, but I always stayed away from one in the crib because I heard it wasn't safe...but I think it's whatever you are comfortable with. I was also told not to have the crib too soft, but ended up getting a twin size mattress pad for under her sheet and she loves it. I figure, if that baby is sleeping, whatever works!!!!