I remember the story of the man who sued his parents for being born because he didn't consent to being born[0]. While as absurd as it is, as I navigate life, I legitimately ponder the question whether it is ethical to have children or not.
That reminds me of James Morrow's This Is The Way The World Ends.
After a nuclear apocalypse wipes out most of humanity, the ghosts of now-will-never-be-born future people hold the survivors to trial because they're ticked off at losing their opportunity to live.
That doesn’t work, on multiple levels. Existing is a prerequisite to wanting; you cannot want if you do not exist. But even if you ignore that, it’s not immediately ethical or unethical to do or not do something just because someone else wants it. But even if you ignore that too, there’s no way of knowing that child won’t be the next genocidal despot. And even if you ignore all that, you could never birth even a fraction of everyone who could ever be born, since those depend on genetics and you can never have every combination of human mating with the other half.
In my aging, I am more unsure of the answer.
[0] https://www.bbc.com/news/world-asia-india-47154287