Baby Doll bears a striking resemblance to the young Jane Hudson, played by Julie Allred from Whatever happened to Baby Jane?, in terms of clothing and appearance and mentality.  There are also striking similarities between the characters in terms of acting ability and being a flop later on in life.  But Baby Doll never grows up physically, even though, she is mentally grown.  Baby Jane, however, does grow up physically but never grows up mentally.  Also Baby Jane usually carries or possesses a doll version of herself. 

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