Re: Can newborn sleep on pillow??
I did what Skeeter suggested and put some rolled recieving blankets under the mattress, not under her. I did this because she has reflux and needed to sleep on an incline, but now she likes it. You can buy specifically made wedges that are designed to fit under bassinet and crib matresses, but what I did works just as well.
Also, the matresses are hard for a reason. I know it doesn't seem comfortable, and sometimes it's not for them, but if they did manage to roll onto it face down it prevents them from being sunken into soft bedding to where they'd suffocate.