Are those 400+ days per parent or divvied up between the parents? I imagine that can have a big impact on how the leave affects companies.
Why don't people do this in Sweden? There are so few kids!
Even in the 1960s in the US, when the working class had much more economic security, and it was easier to financially support children than today, the median number of children per family was still < 3.
https://www.statista.com/statistics/718084/average-number-of...
I think the Swedish culture is also very practically minded. (Romance is dead!) Which means the practical drawbacks from having a big family (car size, expensive vacations etc) will weigh a lot.