God is fair in His Judgements.
Therefore He has a basis for His judgements.
Including for those who are slaughtered in the wombs of their mothers without their performance in this Adamic creation being in evidence.
God is going to deal with them fairly on the basis of evidence He has.
Do we need to know more to settle the question?
Are those slaughtered in the wombs of their mothers going to be judged on the basis of their actions yet to come?
Do you understand from scripture that there was a world predating the Adamic creation?
Do you understand from scripture that there will be a creation after the Adamic creation?
I'm happy to say that none of those questions make me uncomfortable any more.