Fertility is a right now problem for China - it's population has started dropping - its largest cohort is just a few years from being out of child-bearing age, and its fertility rate is one of the lowest in the world, and it will take decades to reverse that even if we knew today how to do it.

This isn't just a question of dropping labour, but also a question of the consequent reduction in economic demand.

Which is why China started reacting to the low fertility rate already in 2013 by abolishing the agency responsible for enforcing the one child policy, followed by ending the policy in 2015, replacing it with a 2 child policy, which failed to have the desired effect, followed by a 3 child policy in 2021, followed a month later by removing all penalties for having even more children.

China's workforce also is at most years from starting to contract excluding any immigration - the cohorts retiring are close to the size of those entering the workforce and the cohorts retiring will be increasing for another 20-30 years, while the ones entering the workforce will be decreasing for the same period even if they somehow figured out how to reverse it today.