Double happiness?

Young mom Yang Yi had a tortuous time giving birth to her first child four years ago and vowed never to have a baby again. Her doctor smiled and said a woman's labor pains were easily erased by the joy of motherhood.

Yang doubted the doctor's advice but late last year gave birth to her second child, this time a boy.

"As our daughter was growing up, we thought it was time to bring her a younger brother or sister," Yang says.