I found this many months ago but it is still relevant. From a Reuters article on the one-child policy:
China’s famous “one child” policy is actually less rigorous than its name suggests, and allows urban parents to have two offspring if they are both only children. Rural couples are allowed a second child if their first is a girl.
This is still the official line in most of China, but the financial hub of Shanghai is now rich enough to focus on a new concern — the burden of an ageing population of native-born Shanghainese…
The number of couples eligible to have two children rose from 4,600 in 2005 to 7,300 in 2008, he added.
Of course, 7300 in a city of over 16 million people… who are the 7300 “eligible”?