From Financial Times
On October 29, China adopted a policy of two children per family, instead of one. This change is, in large part, intended to mitigate the adverse demographic trend plaguing China’s social security system: the rapidly declining ratio of active to retired workers. The ratio is falling from over 6:1 in 2000 to under 2:1 in 2050.
However, the new two-child policy is not likely to have a big impact on the worker-retiree ratio, so China’s retirement system will remain under stress. To sustain social security, China needs to implement other reforms — moving from a local to a national system and expanding the permissible investments for Chinese pensions.
The one-child policy always had exceptions, such as for rural and ethnic communities. These exceptions were broadened in 2013 to cover couples where both were only children. Yet the birth rate did not take off.