The U.N. chose October 31 to mark the world's population reaching 7 billion with a string of festivities worldwide, and a series of symbolic 7-billionth babies being born.
A newly born baby girl named Danica Camacho, the Philippines' symbolic seven billionth baby, as part of the United Nations' seven billion global population projection, is weighed in government's Fabella Maternity hospital in Manila on Monday Oct. 31, 2011. (AP Photo/Erik De Castro, Pool)