Every day in developing countries, 20,000 girls below age 18 give birth. Nine in 10 of these births occur within marriage or a union. This has consequences on the health, education, employment and rights of an untold millions of girls.

A new policy brief from the Population Reference Bureau (PRB), Youth in a Global World, describes what it's like to grow up in today's world, with a special focus on four major experiences in the lives of young people: schooling, health, marriage, and childbearing.