Results: 165/194 (85%) completed the first questionnaire; 130/165 (79%) provided complete data. Mean anxiety but not depression scores were significantly higher in adolescents than adults across pregnancy. Mean (95%CI) first-trimester adolescent Global MAAS was significantly lower than adults (70.3 (68.4, 72.2) vs 76.8 (75.4, 78.2) P ! .01), but there were no significant second-or third-trimester betweengroup differences. Adjusted odds of a lowest-quartile third-trimester MAAS score was significantly associated with lower first-trimester score (P ! .001), previous abortion (P 5 .02) and being born overseas (P 5 .002). Conclusion: Adolescents report slower development of antenatal emotional attachment than adults. Women with risk factors for poor attachment in late pregnancy are identifiable in early pregnancy and may benefit from additional multidisciplinary care. Key Words: Antenatal attachment, Adolescent pregnancy, Teenage pregnancy, Antenatal care, Maternal-fetal emotional attachment