Any comments?
What are your beliefs on the matter? (And trust me, I don't think there's a wrong answer. I know what we all WANT the answer to be, but that doesn't necessarily make it the answer.)
Well, as one who subscribes to a "reformed view" of the Gospel, my perspective may not be welcome. Nevertheless, you asked politely (thank you for that) and I shall try to answer honestly and openly.
The Scriptures tell us (Eph. 1) that the elect have been chosen, "...before the foundation of the world." Thus, those babies who are among the elect are with Christ in heaven irrespective of the length of time their earthly existence lasted. If at conception they were miscarried, they were still humans ("formed in the womb" as David says). If they were murdered in an abortion, they were still humans. If they are murdered at 4 years old, 40 years old or whatever, and they are among the elect...they are rescued. The Scriptures tell us in Romans 9 that the choice of election is up to God and, "Before the twins were born, before they did anything good or bad, God said, 'Jacob I will love. Esau I hate.'"
Thus, from this much you can probably gather what I believe will happen to non-elect babies...the same thing that would happen to them if they lived to be 89. Predestination by a loving God is not the same thing as the Muslim view of "fate", although those who recognize it (predestination, that is) are often grouped with that sick, perverted cult of pagan heresy. But, predestination is a Scriptural concept Paul makes clear in Rom. 8.
I certainly share your observation that those who believe in an "age of accountability" or some such add-on doctrine are in a dilemma with this matter. It would incentivize us to murder every child possible to prevent them from reaching the age and choosing poorly.
In the current day reformed view, all things are being managed by God and there is nothing but justice and mercy in Him. Every detail of every life is orchestrated and there are no accidents or early deaths. All occurs just as God designed and is causing to occur (Prov., Rom. 8).
I don't mean this to be offensive, nor provocative. Thanks for asking, my FRiend.