Historically, women have tended to begin childbearing during their teens and early twenties.
Several factors contribute to the current attention focused on teenage pregnancy and parenthood.
There is currently a large number of young women in the 13 to 19 age range, so that while the birthrates are declining, the absolute number of teenagers is increasing. These statistics do not distinguish between intentional and unintentional pregnancies, or pregnancies occurring in or out of wedlock. From the 1978 figures, only one in six pregnancies concluded as births following marriage, and eight in ten premarital teenage pregnancies were unintended. These trends are occurring at a time when contraceptives are increasingly available to teenagers as a means of avoiding unwanted pregnancy. The evidence documenting the unfavorable consequences of unintended teenage pregnancy and teenage parenthood, whether intended or not, has continued to mount.