Associated Press: Facebook CEO Mark Zuckerberg and his pediatrician wife, Priscilla Chan, are expecting a baby. The co-founder of the world’s largest social network used a Facebook post to announce that Chan is pregnant with a healthy baby daughter. He didn’t say when the baby is due. Zuckerberg, 31, also said the couple had suffered three miscarriages over the last two years. He acknowledged that many people are reluctant to speak publicly about miscarriages. But he said he and Chan, 30, decided to share the information.