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Have the Holy Roman Empress Elisabeth Christine be found to be pregnant in December 1740 after the death of Charles Vi. She was 48 at the time, no doubt probably had gone through menopause. But let's say she's one of those lucky ones who experience the change late. Basically she find's out (&confirms) she's pregnant after Frederick the Great's invasion of Silesia.
a. just as above Empress is pregnant. What will France & Spain do? Bavaria? (he's still going to make the move to be Emperor but how long will the election be delayed for the result of the pregnancy)
b. if she birth's a son say (I have a very specific name Maximilian-Philipp August Stephen Ferdinand Maria Charles Leopold von Habsburg; hit all grand Emperors/Archdukes of old and Stephen for Hungarian sake), how will that affect things? I fancy Maria Theresia not relinquishing her position but being proclaimed regent for her brother (I find her too pivotal to eliminate her with the birth of a posthumous son) until he reaches a majority? But I doubt that'll be the case so how will this affect things?