The only ideas I have are to look at, like, 2 examples: The Victorians and Ulaanbaatar. The Victorians had a bit of a higher birthrate as compared to their con

The only ideas I have are to look at, like, 2 examples: The Victorians and Ulaanbaatar. The Victorians had a bit of a higher birthrate as compared to their continental cousins. This is due to Queen Victoria's penchant for her husband and the subsequently large amount of children she had. Essentially, since the queen had a lot of children, it was fashionable to have more children. Ulaanbaatar is also a fair bit above the fertility rate for the rest of central Asia. Most commenters state this is because of the social status that mothers receive. Mongolia is pretty urbanized, in that most everyone lives in Ulaanbaatar. So parking gets hard, and they have laws that preference mothers with a lot of children for things like parking. They also get little medals/feathers that they wear about and thow in the faces of other women. Since Ulaanbaatar is the place in Mongolia, demographically, these social status rewards end up highly coveted, so people have more kids to get the rewards. Based on these 2 examples, and pretty much nothing else, I'm gong to say the way Japan can reverse the fertility crisis is via social engineering. And based on the Victorians, you can use the power and prestige of the imperial family to accomplish this. Currently, the only young people in the family are Princess Kako (30), Prince Hisahito (18, second in line to the throne), Princess Aiko (23), Princess Akiko (43), Princess Yohko (41), and Princess Tsuguko (38). Essentially, you'd need Prince Hisahito and Princess Aiko (maybe Princess Akiko) to marry quickly (not each other, of course) and have a whole mess of kids. Then play up every little thing possible about these kids growing up in the press. Follow their every move. Make having kids fun and gossipy and a sign of social status. Have the Princesses talk about how easy it is, how hard it is, how fun it is, how they pity women without children. Really be mean about it and hammer it home all the time. Lots of paparazzi stuff, standard British royal family treatment (showing my ignorance here). I'm not Japanese, so what I'm saying here may just be outright impossible though due to cultural expectations.