Sometimes We Pro-lifers Exaggerate

According to Francis W. Porretto:

Abortion was absolutely illegal for nearly all of recorded history;

Abortion certainly was not illegal back in the days of human sacrifice. It was just done after birth. (Given medical techniques at the time, it was safer to do it then.) Even after infanticide became technically illegal, there was little enforcement. Before societies became wealthy enough to afford police forces, the usual enforcement mechanism consisted of relatives out for revenge. This would not apply to kids done in by their own families.