Some branches of Christianity argue about this based on baptism or lack of it along the lines of "an unbaptised soul can not go to heaven".

This raises the question, instead of performing baptism soon after birth (and therefore disregarding the child's choice, because of course it wants to be baptized) why not perform baptism immediately after conception?

Also let us remember that the description of heaven resembles the description of a Borg cube. Do we really want to send our children to become part of the Borg?

Yeah, this is a good point. I still have a lot of friends from my youth that are pretty serious southern baptists/calvinists, and many of them genuinely believe that aborted babies may actually go to hell. They understand it's a strange thing to say, often admitting they could be wrong, but I suppose it's a more logically sealed version of their beliefs, even if it seems strange.

“With or without religion, good people can behave well and bad people can do evil; but for good people to do evil - that takes religion.”

-Steven Weinberg

Most people I talk to believe in an "age of accountability" and that babies do in fact go to heaven. That age? I'm unsure, it ranges up to about 13.

Ok well not sure as to the data, but this suggests that stillborn babies and miscarriages lead to children going to heaven https://thefederalist.com/2017/05/05/christians-believe-misc...