LO is 7 months old and we never used a crib bumper but now I'm thinking we might need to. In her sleep, I guess she moves around a lot because she'll wake up screaming because she has managed to jam her self into the corner of her crib with her head pressing against the slats and one of her limbs hanging out, and she can't get herself out.

Does anyone here use a crib bumper? What age did you start?