This is an amazing quote from the late 2nd century…reposted here.
We [Christians], on our part, believe the angels to officiate herein for God. The embryo therefore becomes a human being in the womb from the moment that its form is completed. The law of Moses, indeed, punishes with due penalties the man who shall cause abortion, inasmuch as there exists already the rudiment of a human being, which has imputed to it even now the condition of life and death, since it is already liable to the issues of both, although, by living still in the mother, it for the most part shares its own state with the mother.
Tertullian, “A Treatise on the Soul,” Chapter 37