The American Academy of Pediatrics recommends against bumpers because they increase the risk of SIDS. I was so afraid of pretty much everything that Charlie has never had anything in his crib. He's slept in a sleep sack until now, and he's never even had a lovey (but that was just because he uses the onesie that he wears for every bedtime as his lovey).
I bought bumpers for Olive and was going to use them until she started moving, but I never got around to putting them on.
Are you or did you use bumpers? Did you ever take them off at some point?