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While Cary's advice on what you really OUGHT to do (move out) isn't too bad, his attempt at legal advice is unbelievably, horrifyingly wrong. Unless there's a whole lot to this letter that didn't get published, they are not your landlords. They can't do a damn thing to get you to leave... except the whole "bringing home a newborn" thing.
Move out on your own time. Let them know how you feel before you leave. And grow a spine.