Why are so many people having fewer and fewer children?

Becase you have given women automony; via work, the right to choose and mostly taken religious shaming away. When they control their destiny, they'll mostly choose 0,1 or 2 children.. Replacement rate for a steady population is 2.1

No amount of childcare subsidy or work flexibility will change that, it's the same in places like Swdean. Same all over the world in developed countries