Crib Bumpers?

Are they safe? My child is 13 months old and as she's getting more active, she is always banging her head of her feet or her arms against the side of the wooden crib. Or her limbs will get stuck in between the slats of the crib. And she cries!

Would a braided crib bumper be safe? Comment please and give reasons if you can.

*edit*

Thank you for the comments so far! Sooo any advice on how to keep my baby safe in her crib (from bumping and getting stuck and hurting herself)