A crib rail bumper is formed with a cushioning pad, a fabric cover dimensioned to encompass the pad, and reversible fastening means on opposite sides of the cover for securing the cover and pad to the crib rail. The reversible fastening means is preferably a reversible zipper. The crib rail bumper is compressible along the length dimension so as to encompass crib rails of varying lengths. The cushioning pad has a major length dimension, a minor width dimension, and a thickness dimension, the dimensions being selected for encompassing a crib rail. The reversible fastener allows multiple bumpers to be attached together to encompass wide rails or a plurality of rails.