The drop-side rails on the crib can malfunction, detach or unexpectedly fall down, causing part of the drop side to fall out of position. When this happens, a space is created into which an infant or toddler can roll and become wedged or entrapped, which can lead to strangulation or suffocation. A child can also fall out of the crib. Drop-side incidents can also occur due to incorrect assembly and due to age-related wear and tear.

Thank you to the US Consumer Product Safety Commission...