At age 11, Ghulam was married off to 40-year-old Jaiz in a rural Afghan village, making her only one of more than 10 million young girls who are being forced to wed men old enough to be their fathers or grandfather every year. In an effort to start a global conversation about the devastating effects of early marriages, which are currently practiced in more than 50 developing countries, the United Nations designated October 11 as International Day of the Girl Child this year. To mark the occasion and draw attention to the problem of child brides, photojournalist Stephanie Sinclair teamed up with National Geographic to create a series of heart-breaking photos depicting girls as young as five years old being married off to middle-aged men in countries like India, Yemen and Ethiopia. Child mothers: Asia, a 14-year-old mother, washes her new baby girl at home in Hajjah while her two-year-old daughter plays. Disturbing: Faiz, 40 (left), and Ghulam (right), 11, sit in her home prior to their wedding in the rural Damarda Village, Afghanistan on September 11, 2005. Rock bottom: A young prostitute named China sits stunned after being beat up by a man visiting Kabele Five in Bahir Dar, Ethiopia.