Having children is borderline unethical given the capitalist hellscape they will be born into, the relatively high likelihood that they will not be able to live to old age due to risk of large parts of the planet becoming uninhabitable with climate change, and considering that reduced birth rates is the most ethical path to a lower population on the planet, which, though technically not a strict requirement of a greener future, certainly makes it a lot easier.
No shade for any kids living today or parents who choose to have them despite the above. I understand why people do it and I don't blame anyone for it. But it is worth pointing out that current birth rates in most countries are not sustainable, and the seemingly constant fearmongering about falling birthrates in places where it's low needs to go away. Yes, it's bad for the economy if the new generation is smaller than their parents. That's a problem with the system and its design (one of many), and not at all a rationale for having kids.