China's total fertility rate has decreased over time. In 1950-1955 the average fertility rate for a women was just above 6.0. Over the space of 50-55 years, the fertility rate has decreased. In 2010, the fertility rate fell to below 2.0.
NationMaster Scroll down to the interactive map - mouse over each country to see its fertility rate. The necessary replacement rate is about 2.1. USA is on the brink. Many countries (Canada, Japan, Italy, Russia, for a few) are below this.