When abortion is used on several of the fetuses in a multiple pregnancy of large amount. For example, aborting 5 of 7 fetuses in the mother.

It is used to reduce quantity to improve quality. When such a large number of fetuses implant in the uterus, they must fight for space and food, and there is a high tendency for most or all to be born with defects. By employing reduction, a mother can end up with healthy twins instead.

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