What are "crib bumpers"?

What are "crib bumpers"?

Kimberlee Mitchell (National Child Safety Expert ) gives expert video advice on: How can I prevent my baby from injuring himself while he is inside the crib?; Where is the most effective place to put a baby monitor?; How do I childproof my windows? and more...

A crib bumper is the padding you put in the crib that goes around its circumference to keep the baby from bumping his or her head while he or she is sleeping in the crib. It's important to take the crib bumper out once your child is sitting up because it can be used as a stepping stool to get out or fall out of the crib.