DisneyCarToys Barbie Baby Sitter from the Mattel Barbie I Can Be a Baby Sitter playset. Barbie baby sits a cute baby doll girl that has a color changing diaper! Barbie can feed the baby a bottle of water and then the baby actually pees and her diaper color changes from white to yellow. For the color changing Barbie baby doll, you can use hot or cold water to fill the diaper and feed the baby. The new playset also comes with a Fisher-Price designed baby swing and Fisher-Price infant pack n play. In this Barbie doll parody Barbie is kind of a bad baby sitter because she drops the baby and doesn't know how to change a diaper.