Having determined what the unborn is, we turn to the question of value. Do the unborn have moral value? What gives humans value? Is value objective and intrinsic, or subjective and intrinsic. Theists argue for the former, whereas non-theists the latter. Theists believe value is inherent to being human, whereas non-theists argue that it is based on humans' ability to exhibit certain functions.
Virtually everyone agrees that born have value. If you are going to maintain that the unborn lack that same value, you must demonstrate some morally significant difference between the born and the unborn. There are only four differences between the born and unborn, and none of those differences are morally significant. It follows, then, that the unborn are just as valuable as the born. All humans, both born and unborn, have a right to life.