Monitoring sexual activity and contraceptive use among U.S. adolescents is important for understanding differences in their risk of pregnancy. In 2013, the U.S. birth rate for teenagers aged 15-19 dropped 57% from its peak in 1991, paralleling a decline in the teen "pregnancy" rate. But these rates are still higher than those in other developed countries. Using data from the 1988 to 2011-2013 National Survey of Family Growth (NSFG), this report provides trends and recent national estimates of sexual activity, contraceptive use, and childbearing among teenagers aged 15-19.