I'm extremely fortunate to be working at a large tech company and I have good money, but even with my income having a kid would be financially ruinous for us. Daycare costs alone are ludicrous, somewhere in the region of 2000-3000 euros PER MONTH. Now, most people get some form of gov't support for things like these, but we definitely wouldn't due to my income, and while I'm well off, I'm not that well off to be able to afford an expense like that.
Not to mention all the other costs associated with having a child, both material like the ludicrous price of housing but also mental.