Also, women's education had been seen across the entire world to be the primary cause of falling birth rates.
Coincidence is not a casue
Would you be willing to take women's right for education away to restore birth rates?
Because it doesn't work. The Duce tried that and the birth rate barely budged.
A high birthrate is driven by either
1) children being a direct investiment to get labour-power to produce for the family
2) The prespective of a brighter future ahead. Today raising a kid is expensive, society is fragmented and the future filled with debts and bleakness, so people don't bother.