As of February 28, 2013, importers and manufacturers of infant and toddler play yards, sometimes referred to as playpens, are required by law to test their products so they meet new safety standards designed to prevent injuries and deaths to children. New play yards must be tested for stability to prevent tipping, minimum side height requirements to prevent children from climbing out of the play yard, and lock mechanisms that prevent the play yard from collapsing while in use…. More