Some pro-choice advocates claim that life can’t begin at conception because pregnancy begins when the embryo implants in the uterus. How can a woman have a “life” inside of her before she is even pregnant? But pregnancy is a condition associated with the woman’s body, not the unborn child’s. This reply doesn’t answer the question of when the child comes into existence. Even pro-choice philosophers such as David Boonin admit that defining pregnancy as beginning at implantation does nothing to disprove the pro-life advocate’s case that human beings begin to exist at conception.
