That human life begins at conception is an implicit, but foundational doctrine of Christianity, according to this LifeQuotefrom Lutherans for Life:
“To deny full humanity to a conceptus [embryo] is to deny full humanity to the Savior, ‘qui conceptus est de Spiritu Sancto, natus ex Maria virgine’ (Latin). We worship the coming Savior, we worship the ascended Lord, we worship the resurrected Son of Man, we worship the crucified Lamb, we worship the Boy in the temple, we worship the Babe in the manger, we worship the Conceptus in the womb of the Mother of God. Amen.” Posted on Cyberbrethren a Lutheran Blog.
And here is a fitting devotion during Advent: Adoring Christ the Embryo.