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.