Will this help? I'm unsure. Children are heavily subsidized in Scandinavian countries with pro natalist policies (in some circumstances, governments paying cash for children does not move the needle much and comes at a high cost), not subsidized much at all in China comparatively, and both cohorts continue to see a decline in total fertility rates. These are complex systems problems where the cost to modify inputs is high, and latency in feedback also high.
https://thehill.com/opinion/immigration/4141600-pro-natalist...
https://ifstudies.org/blog/pro-natal-policies-work-but-they-...
https://www.unfpa.org/sites/default/files/pub-pdf/Policy_res...
https://www.scmp.com/week-asia/economics/article/3136991/can...