Preschool TV is booming. That's good for business, but what about kids? Since the advent of Sesame Street in 1969 the field has expanded. Now there are entire channels -- like Disney Junior -- devoted to the youngest of viewers. The Business producer Darby Maloney sits in with Disney Junior executives and educational researchers as they test out a new show, Sofia the First -- at a preschool. Then she discusses the making of preschool TV -- princesses, muppets and the rest -- with Nancy Kanter, Senior Vice President of Original Programming at Disney Junior and General Manager of Disney Junior Worldwide, and Carol-Lynn Parente, Senior Vice President of Sesame Workshop, Executive Producer of Sesame Street.