It’s women’s rights that causes that. Turns out, making and raising a baby more than one or two times is not a preferred option. And zero is preferred a lot of times too.
It's not a correlation, it's a conditional statement.
If women have the option to choose, then the vast majority choose 0, 1, or 2 kids. This conditional statement is upheld by basically all the total fertility rate trends in the world.
I'm seeing the same trends in rural and urban areas.