Here are a few articles to keep abreast of the latest safety concerns and recalls with baby slings in order for you and your employers to stay informed.  Slings have been linked to infant deaths caused by suffocation, mostly with very young and small newborns.  This article from NPR explains more:

http://www.npr.org/templates/story/story.php?storyId=124505838

Also, some ‘Infantino’ brand baby slings have been recalled:

http://www.npr.org/blogs/thetwo-way/2010/03/one_million_infantino_baby_sli.html