Some scifi movie I saw in the late 70’s, I think. It was about a human-looking male alien who briefly lived with a woman in her apartment. (Backstory – the woman’s little girl had died around age 3.) For some reason I can’t recall, the alien departed and left some weird incubator in the woman’s apartment, with scary alien baby inside it. The lady freaks out and tries to dismantle it but the baby manages to crawl out alive. As she watches it, she notices that it’s not metallic but covered in a coating. When she reaches to remove the coating, the alien baby turns out to be a clone of her dead daughter. Any clues?