Childhood environment

Women exposed to abuse, domestic violence, and family strife in childhood are more likely to become pregnant as teenagers, and the risk of becoming pregnant as a teenager increases with the number of adverse childhood experiences. According to a 2004 study, one-third of teenage pregnancies could be prevented by eliminating exposure to abuse, violence, and family strife. The researchers note that "family dysfunction has enduring and unfavorable health consequences for women during the adolescent years, the childbearing years, and beyond." When the family environment does not include adverse childhood experiences, becoming pregnant as an adolescent does not appear to raise the likelihood of long-term, negative psychosocial consequences. Studies have also found that boys raised in homes with a battered mother, or who experienced physical violence directly, were significantly more likely to impregnate a girl

Studies have also found that girls whose fathers left the family early in their lives had the highest rates of early sexual activity and adolescent pregnancy. Girls whose fathers left them at a later age had a lower rate of early sexual activity, and the lowest rates are found in girls whose fathers were present throughout their childhood. Even when the researchers took into account other factors that could have contributed to early sexual activity and pregnancy, such as behavioral problems and life adversity, early father-absent girls were still about five times more likely in the United States and three times more likely in New Zealand to become pregnant as adolescents than were father-present girls.

Low educational expectations have been pinpointed as a risk factor A girl is also more likely to become a teenage parent if her mother or older sister gave birth in her teens. A majority of respondents in a 1988 Joint Center for Political and Economic Studies survey attributed the occurrence of adolescent pregnancy to a breakdown of communication between parents and child and also to inadequate parental supervision.

Foster care youth are more likely than their peers to become pregnant as teenagers. The National Casey Alumni Study, which surveyed foster care alumni from 23 communities across the United States, found the birth rate for girls in foster care was more than double the rate of their peers outside the foster care system. A University of Chicago study of youth transitioning out of foster care in Illinois, Iowa, and Wisconsin found that nearly half of the females had been pregnant by age 19. The Utah Department of Human Services found that girls who had left the foster care system between 1999 and 2004 had a birth rate nearly 3 times the rate for girls in the general population.