Crib bumper pads became popular in older-style cribs where the slats were far enough apart that a baby's head could become trapped between the slats, posing an entrapment or suffocation risk. Today, all crib bumper pads sold in the United States and Canada are required to have slats close enough together that it's nearly impossible for an infant's head to fit through.
Often, parents do not remove the crib bumper pads once the baby can stand up in the crib. The crib bumper pads can provide a foothold that could allow the baby to climb out of the crib and fall. Rebreathing of stale air is another concern with crib bumper pads. The bumper reduces the flow of fresh air around the baby, particularly if his or her face is very close to the bumper.
