New federal safety standards that took effect Dec. 28 require child care facilities and hotels to use cribs that do not have drop sides. Infants can become stuck or strangle in between the drop side and the mattress. Repair kits and immobilizers are not allowed to be used to fix the drop side of the cribs.

In addition, cribs must have stronger slats and hardware and better mattress support. More safety tests also are done before they can be sold. All cribs sold after June 28, 2011, must meet the standards. For details or to check whether a crib complies, visit