"'It seems probable that the foetus does not possess a rational soul as long as it is in the womb, and only begins to possess it when born, and consequently in no abortion is homicide committed.' Sextus V inflicted severe penalties for the crime of abortion at any period; these were in some degree mitigated by Gregory XIV, who, however, still held that those producing the abortion of an animated foetus should be subject to them, viz., and excommunication reserved to the bishop and also an 'irregularity' reserved to the Pope himself for absolution."
From WOMAN and THE NEW RACE - W.W. Norton
The highlighted part, I guess, implies some religious, Catholic, information, which I found beyond my understanding. Please help.