Ok, so I know you shouldn't use a cot bumper due to risk of suffocating with small babies who can't move their head but are they ok to use with a 9 month old? My baby girl is a proper wriggler at night and the thing that keeps waking her up is her bumping into the sides of her cot. I'm desperate for a good nights sleep and am sure she needs it too. Obviously not wanting to put her at any risk though ....