Children are extremely expensive. I have raised 4. You are broke the entire time and can always spend more on them.
In the US you are 1 medical incident from not affording anything and relying on welfare
https://www.thestreet.com/personal-finance/cost-to-raise-chi...
You must have a very weird definition of "cheap".
My current plan:
$100/mo - me
$125/mo - me + child(ren)
$350/mo - me + spouse + child(ren)
You are referring to a benefit you get from your salaried position. Nice but many developers do not have this luxury.
Imagine all the hand wringing that would ensue if at lunch with my colleagues (which is a rough approximation of the HN demographic) I mentioned that I got a 5yo hand-me-down car seat instead of buying the latest and greatest. Generalize that pressure to pretty much every child raising related expense.
I know plastics become more brittle with age but a modern car seat that's expired is going to be tons safer than a car seat from 2000 (mostly because engineers now have better access to good simulation tools at lower cost). So what if little Jimmy isn't maximally safe. He's still a heck of a lot safer (from an unlikely edge case no less) than he would have been if he were born 15yr ago.
How do you know this? Maybe there's technology (crumple areas) that only works when the plastic is relatively new or cushion areas that only are most effective before they degrade, thus making them less safe than good old fashion plastic. We see this with modern cars in their bumper technology - they take the first impact better, but they aren't as rugged as older models. Do you actually know the trade-off, or are you just assuming?
I'm broadly sympathetic to your viewpoint, but this isn't accurate. Children are fundamentally not expensive. The problem is that couples believe they can't afford to have kids, not that they actually can't afford them.