That’s for economic reasons that have nothing to do with gender issues.

In Norway, housing costs have skyrocketed like in the rest of the rest of the western world. This plays a significant role in the decline of birth rates. Also, as populations increase in wealth and education, birth rates tend to go down, because parents prioritize focusing on fewer children rather than having more to support an agrarian economy. It is economy-driven. The effects on female empowerment are interwoven with that. Women tend to do better in better economies, because better economies focus more on service industries rather than material ones, which favor women over men.

I don’t think that’s it.

No, it’s not. Many studies have confirmed this. Do your research.