In order to argue against abortion it is necessary to show that the embryo/foetus has moral status; in other words that it is the type of being which is morally significant and should not be killed unjustifiably.  Human infants after birth are generally accepted to be these types of being.

If we proceed from the assumption that, after birth, human infants are beings with moral status (who therefore enjoy a right to life), the onus is on pro-abortion advocates to show how the nature of a newborn infant is different from the foetus before birth;