> I've had a suspicion there is something unethical about this.
Why?
As a human being who was once born, I am extremely grateful for my existence, and how much thought my parents put into it beforehand is of practically no consequence.
You seem to imply that if parents haven't already committed to giving their kids a perfect childhood with perfect parenting then the kids are better off not living at all?
You can browse the Wikipedia article I linked. It offers a few possible answers to this why question.
As for myself I would simply summarize that making an important choice such as bringing life into the world, without considering the consequences, is already somewhat unethical. One should think before taking an action that has irreversible consequences to anyone. In this case, the person being born. I wouldn't say I'm an antinatalist, I just find it interesting. On a rational level I'm not sure there are many good arguments against some of the conclusions there. If there are I'd be interested in hearing them. The fact that you are personally grateful for your existence is a pretty weak argument imo. If you had never been born you would not be around to know the difference. However had your existence been different it is not so hard to imagine you might feel differently. Surely your life is not so peachy that a scan of that article will be incomprehensible to you. Then again, perhaps you simply lived a far better life than I.
I'm not taking a position one way or the other. As I said, I just find it interesting.