Experts are warning that the country's new family planning measures could have unintended, but far-reaching, consequences. Wang Xiaodong reports.

In recent years, the treatment of pregnant patients has become an increasingly thorny task for Liu Wenxian, a cardiologist at Anzhen Hospital in Beijing, as a result of the rise in the number of older women wanting to give birth.

"Many of these women are from outside Beijing and have risky complications such as cardiac disease," she said.