Loosen the screws or bolts on the bars at the outside corners of your sleigh crib using a screwdriver or a wrench fitting the particular size of the bolts on your crib model.
Pull apart the corners of the crib at all four corners of the crib gently--just enough to be able to feed the cloth bumper ties through each corner.
Place the bumper in your crib and feed the corner end ties--which are traditionally meant to be tied around the corner posts--through the corners that have been loosened.
Pull the ties tight to straighten out the bumper, and tie the ends around the stabilizing bars on the outside bottom of your crib to secure. Tighten the screws at all four corners of the crib, ensuring the fabric of the bumper ties lies flat in between the wood of your crib. If it is bunched up, it could make it difficult to retighten the corners.
Tie the rest of the ties as normal to the slats on the sides.