In reality, none of these have a tangible correlation to TFR, which is driven largely by economic considerations [0]

TFR drop is global now that people are increasingly educated and don't want to push back their careers by several years and reduce their earning potential as major reason why women on aggregate are paid less than men - the same salaries are paid, but women who have kids are out of the workforce for a couple years [1].

[0] - https://www.economicstrategygroup.org/wp-content/uploads/202...

[1] - https://www.census.gov/library/stories/2020/06/cost-of-mothe...

  The total fertility rate (TFR) is the average number of live births that a woman would have during her life if she experienced the age-specific fertility rates of a given period (usually a year). It excludes the effect of mortality and is usually expressed as births per woman.