Friends’ drinking behaviors may be key to risky drinking among pregnant teens and young adults, according to a new study. Researchers used a previously untried approach to examine the ways that adolescents’ and young adults’ alcohol use and beliefs before they become pregnant related to their drinking as they entered into motherhood. Young mothers may be particularly vulnerable to moderate or heavy drinking during pregnancy, with adverse outcomes for their babies. Understanding the factors that influence risky alcohol use in pregnancy (3+ drinks per occasion) is important for identifying and supporting at-risk teens and young adults. The study in Alcoholism: Clinical & Experimental Research may be the first to use data collected before pregnancy, minimizing inaccurate recall.