Welcome back sleepy.Meanwhile, births in China declined 12% Y/Y in 2021 vis-a-vis 2020 with early provisional data from 2022 suggesting a similar Y/Y drop.
US total births 2021: 3.7M
China total births 2021: 10.6M
At the current rate of China's births dropping in double digit percentages each year but US births increasing in small increments each year, 3.7(1.036)^x = 10.6(1-.12)^x, in 7 years, the number of births in the US will exceed the number of births in China; 4.7 million to 4.3 million
Post the ethnic breakdown of America's rise in fertility rate. Most of the growth in births will be down to migration from countries with higher birth rates. It isn't organic growth and will taper as immigrants assimilate.