Infantilist Cartoon Character

Pink Diaper's DeviantArt Blog lead me to stumbling across this video involving a lesbian adult baby character and her caretaker, as part of the official story, which I thought was pretty neat. She's only a secondary character, but it's still not something which I would have expected to see handled seriously, rather than as a joke.

edit: Since the video disappeared from youtube, I've uploaded a version to blogger here, which unfortunately reduces the quality: