Since China abolished its one-child policy on January 1 2016, annual births, after a temporary increase to 17.86 million that year, have actually fallen, from 16.55 million in 2015 to 15.23 million in 2018. The baby boom that wasn’t should surprise no one.
No other successful east Asian economy has ever imposed a one-child policy, but all have fertility rates far below replacement level. Japan’s fertility rate is 1.48 children per woman, South Korea’s is 1.32 and Taiwan’s 1.22. China’s fertility rate will almost certainly remain well below replacement level, even if all restrictions on family size are now removed.