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.