[niemandhier]

My observation is, that it is about child care.

Guarantee all parents affordable child care close to their work or home and many people settling for one kid will have two.

[dagw]

Guarantee all parents affordable child care close to their work or home

Sweden has that (and generous parental leave policies) and still has both low and declining birth rates.

[ChuckNorris89]

Sweden also has very expensive CoL/housing.