"Consciousness does not begin until after 20 weeks’ gestation. 12 13 Thus we do not begin to exist as persons, as morally relevant entities, until at least 20 weeks of fetal gestation. The question of when and if killing occurs does not even arise until at least 20 weeks’ gestation. On this account, killing a fetus before 20 weeks is not killing a person, it is preventing a person coming into existence."