It’s more than that per month just for childcare, assuming they are anticipating they will continue to work. It’s significantly more than that in food, Healthcare etc per month. If all you need is $750/month to have a child, than you can already have a child.
But the reality is, their lifestyle will eat that $750, and they’ll continue thinking they can’t afford to have a child. And, frankly, they probably can’t. Children are for the poor and the upper-middle class and above. It’s weird, but it’s true.