Well, we know spiritually dead people need faith in Christ according to our sovereign God. Are they capable of this?
What it amounts to is a fetus must be saved in some other way besides grace through faith or a fetus cannot be saved. (according to Calvinism)
OK - a couple of quick thoughts before I crash on the couch again (not feeling well):
* If one is conceived sinless and they can go to heaven because they have not sinned, then their salvation is based on what they did or did not do - works. It is not through the belief/faith that is a requirement in Scripture but it is based on their not sinning. I do not see this as Scriptural.
* If one is conceived with an original sin, there are two choices - either God "elects" them to salvation as the idea of the doctrine of grace speaks of and gives them the faith in whatever way they need it that they need or else He condemns them to hell justly. He does not ever send anyone to hell unjustly or else He is not God.
The God of Scripture is just, merciful and right. He does not contradict the Word that He gave us. If He sends someone to hell, it's because they deserve hell. Whether WE feel that person deserves hell is not an issue because we're not God. We don't know hearts, we cannot see beyond our knowledge. Saying that a baby is conceived in sin and that he can go to heaven is not against God's character - nor is it against His character to say that he will go to hell. We just honestly don't know the how or why a baby goes to wherever they do when they die.
The bigger issue to us here on earth, rather than arguing about where a baby will go if they die at 8 weeks gestation is what are we doing to spread God's Word? What are we doing to preach the Gospel to everyone we meet? Why are we arguing about something that we have no control over? It's just ridiculous, IMO.