Mood and Excess Weight Gain in Adolescent Pregnancy

50-70% of adolescents gain too much weight during pregnancy, and this excess gain significantly increases their risk of high postpartum weight retention and long-term obesity. In this randomized controlled pilot study, the investigators are evaluating the feasibility and acceptability of a relatively brief interpersonal psychotherapy program for reducing excess gestational weight gain during adolescent pregnancy. Compared to treatment-as-usual prenatal care delivered in an adolescent maternity clinic, the investigators will estimate the added benefit of an interpersonal psychotherapy program\'s effectiveness for reducing excess gestational weight gain, improving maternal postpartum insulin sensitivity, and decreasing maternal and infant adiposity.