>>532288141
Probably has to do with shorter life expectancies during our hunter-gatherer days, longer growth rates(human babies take an insanely fucking long time to reach independence compared to most species on earth who can fend for themselves the moment they're born), and overall promiscuity of humans as a species. If hags never stopped giving birth there would be a never ending flood of poorly raised children blotting out every ecosystem on earth, so we evolved a natural stopgap that made childbirth into an event women would usually only experience a few times in their lives while older, infertile members of the tribe helped raise the children.