The ability to decide on the number and spacing of one’s children is taken for granted by many in the developed world and among elites in developing countries. Yet, for a majority of people in developing countries, especially the poorest ones, the power and means to determine the size of their families are scarce or inadequate. An estimated 222 million women lack access to reliable, high-quality family planning services, information and supplies, putting them at risk of unintended pregnancy. In developed countries too, high levels of unintended pregnancy exist, especially among adolescents, the poor and ethnic minorities.