From time to time someone argues that abortion couldn’t be against the natural law, because sometimes during the course of gestation spontaneous abortions occur.
Here is the difference. In one case, the unborn child dies because something goes dreadfully wrong during the natural process of development. In the other, he dies because someone kills him.
The two kinds of death are not comparable. A miscarriage should no more be called a “spontaneous abortion” than the death of a grown man from a heart attack should be called a “spontaneous homicide.”