At least in the US, children are effectively a tax on the working class. How many people do you know that had to keep working to put their kids through college? Why do workplaces have tax-incentivized college savings accounts? Why does it cost employees to add children to employer-sponsored health insurance?
The system is very much set up to disincentive having kids. If you do have them, the trade is that you will always be financially drained. Somewhere between 60-80% of Americans live paycheck to paycheck. Very few will ever acquire equity in anything.
The American Dream is now working until you're 70, supporting 2 kids through college, building equity in your house, then reverse-mortgaging your property to hopefully cover your final years.
You could argue that it's an organic evolution of our profit-driven system, but that system only exists because it's what the owner-class is pushing.
Either we should accept that having children is a hobby for the rich and find other meaningful ways to live our lives, or we should have radical changes in society to increase family sizes.