From his commentary on Genesis 25, this is Luther:
"He [God] is not hostile to children, as we are. But God emphsizes his word to such an extent that He sometimes gives offspring even to those who do not desire it, yes even hate it...How great, therefore, the wickedness of human nature is! How many girls there are who prevent conception and kill and expel tender fetuses, although procreation is the work of God" (italics Di Mauro's, 25).And Calvin, from his Commentaries on the Last Four Books of Moses:
[T]he foetus, though enclosed in the womb of its mother, is already a human being (homo), and it is almost a monstrous crime to rob it of the life which it has not yet begun to enjoy. If it seems more horrible to kill a man in his own house than in a field, because a man's house is his place of most secure refuge, it ought surely to be deemed more atrocious to destroy a foetus in the womb before it has come to light..." (quoted in Di Mauro, 26).