Quadruplets' parents neaten swaddling clothes before they leave hospital in Weifang city, east China's Shandong Province, Nov. 20, 2007. 37-year-old Zhang Lan gave birth to the quadruplets in the hospital on Nov. 12. (Xinhua Photo)

The nurses of Weifang People Hospital carry quadruplets in the arms before they leave hospital in Weifang city, east China's Shandong Province, Nov. 20, 2007. 37-year-old Zhang Lan gave birth to the quadruplets in the hospital on Nov. 12. (Xinhua Photo) The nurse of Weifang People Hospital gives physical check-up to quadruplets before they leave hospital in Weifang city, east China's Shandong Province, Nov. 20, 2007. 37-year-old Zhang Lan gave birth to the quadruplets in the hospital on Nov. 12. (Xinhua Photo)