Clement of Alexandria (Mid-2nd Century) (from his notes):
The providence of God doth not light upon them only that are in the flesh. For example, Peter in the Apocalypse saith that the children born out of due time (abortively) that would have been of the better part (i. e. would have been saved if they had lived) -these are delivered to a care-taking angel, that they may partake of knowledge and obtain the better abode, having suffered what they would have suffered had they been in the body. But the others (i.e. those who would not have been saved, had they lived) shall only obtain salvation, as beings that have been injured and had mercy shown to them, and shall continue without torment, receiving that as a reward.
But the milk of the mothers, flowing from their breasts and congealing, saith Peter in the Apocalypse, shall engender small beasts (snakes) devouring the flesh, and these running upon them devour them: teaching that the torments come to pass because of the sins (correspond to the sins).
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Find more of what the early Christians thought on my Christian History page!