The Mattel Potty Training Kelly Baby Sister of Barbie is a vintage 4-inch play doll from 1996. This blonde-haired, blue-eyed doll is part of the Barbie franchise and is made of plastic. The set includes just the doll, making it a collectible item for fans of the Barbie and Kelly characters. With its Caucasian ethnicity and youth age group, this original Mattel doll is a nostalgic piece for those who appreciate classic Barbie dolls from the 1990s.