What was the name of following Horror Short Film from 70's (I believe)?

This short film involves a mother, whom everyone believes is crazy. She insists that her newborn is trying to kill her, because it didn't want to leave the womb. It tries driving her crazy, and toasting her with a faulty electric blanket. Her doctor comes over to sedate her, and realizes (too late) that she... show more This short film involves a mother, whom everyone believes is crazy. She insists that her newborn is trying to kill her, because it didn't want to leave the womb. It tries driving her crazy, and toasting her with a faulty electric blanket. Her doctor comes over to sedate her, and realizes (too late) that she isn't crazy.
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