The whole point is that being a parent is compensated in a way that no other choice is.
Parents take on a significant burden. They are compensated for it. There is no choice I can make as a non-parent that will provide me with similar compensation.
If just this financial support provided by some governments then consider you could take on a very low pay job with a nonprofit and get similar 'compensation'. Albeit spread across the length of that career instead of front loaded as paternity leave/credits.
> Some countries give more than a year paid parental leave
You yourself are making my point by saying “similar compensation” “albeit spread across the length of a career.” There is nothing for non-parents that is equivalent to parental leave.
And these leave benefits are just so miniscule compared to the effort and finances required for each child. So why complain about missing them?
> If society does nothing to help then more parents will choose to have fewer, or no, children.
Fewer people is our best option (it is still a terrible option, don't get me wrong) for mitigating the effects of climate change.
Your parents having you is a miniscule benefit to you?
And one gives up so much time and energy being a parent, unless you're wealthy enough to outsource large chunks of the work. (Daycare in the US is 10-25K per year.)