i've had my daughter with a pillow (or pillows depending on size) since she's 1 yr old. i prefer to give her an adult size pillow because it fits snug from side to side in the crib. SOMETIMES (just recently) she's decided that if she doesn't really feel like sleeping, she'll crawl under the pillow, but she's fine, we have a video monitor and see she's ok. also once she does get tired, she sits up, fluffs up her pillow, and puts it like i do, then lays on it. she sometimes will sleep completely on the pillow, and not on the mattress, but sometimes she'll roll off the pillow and not use it at all. all depends on how much movement there is at night. she's now almost 19 months old, so she's had a pillow for just about 6 months or more now and is perfectly fine. if you don't like the thought of a pillow, you could always give her 2 blankets, one to roll up as a pillow, and one to cover her with, but i personally would be worried about getting caught up in the extra blankets. try one of your pillows while she's napping, since it's a shorter period of time, and you'll be awake to keep checking on her. or just go with your gut feeling. some things aren't right for everyone. just because i feel completely comfortable with it doesn't mean you should. and just to let you know, i started with the smaller pillow and they made me really nervous...she would always slide her head off them, and wind up smooshin her face into/under it. that's y i went to the adult pillows.