Residents crowd in a swimming pool to escape the summer heat during a hot weather spell in Daying county of Suining, Sichuan province in this July 4, 2010 file picture. China is mulling changes to its one-child policy, a former family planning official said, with government advisory bodies drafting proposals in the face of a rapidly ageing society in the world&#039;s most populous nation. Proposed changes would allow for urban couples to have a second child, even if one of the parents is themselves not an only child, the China Daily cited Zhang Weiqing, the former head of the National Population and Family Planning Commission, as saying on November 28, 2012. REUTERS/Stringer/Files