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Kind of reminds me of Brood, which was a David Cronenberg film, but I think the wife was killed inside a lab, not a cabin. The movie basically involved a woman being guided by a psychiatrist to internalize her negative feelings and the end result involved these negative feelings becoming demonic toddlers who went out and killed people. Included a scene where a kindergarten teacher gets bludgeoned to death in front of her class IIRC.

One for a friend of mine. It was from the 80s, a cheap sci-fi style movie (maybe made for TV).
A man finds his wife in a cabin where she has given birth to he thinks alien babies and she is feeding them. It was a graphic scene. At the end he burnt the place down.
Thanks to anyone who can help.