After a period of decline , the birth rate for U.S. teenagers 15 to 19 years rose in 2007 by about 1 percent , to 42.5 births per 1,000 , according to preliminary data in a March 2009 report by the Centers for Disease Control and Prevention 's National Center for Health Statistics . Ten percent of women are pregnant by their 20th birthday , survey finds . Survey : Most believe that college , careers are key to their future . Most participants in study believe that parents give positive messages .
Ten percent of women are pregnant by their 20th birthday , survey finds . Survey : Most believe that college , careers are key to their future . Most participants in study believe that parents give positive messages .