This book examines family interactions and relationships during the transition to parenthood. It offers a unique integration of different lines of research on prenatal family dynamics contributed by leading family researchers in North America and Europe who use observational approaches to study emergent family processes. The book explores prenatal dynamics in diverse families, including adolescent couples, same-sex couples, couples experiencing infertility, and couples expecting their second child. The introduction, anchored in family systems and structural theories, provides an overview of challenges couples commonly experience during the transition to parenthood and details prenatal family processes that predict postpartum adjustment in families. This sets the stage for subsequent chapters by emphasizing unparalleled windows into prenatal family dynamics provided by direct observation. Initial chapters focus on predictors of prenatal interactions and partners’ representations of parenthood. Subsequent chapters describe original research on prebirth couple interactions and the coparenting relationship emerging during pregnancy. The volume includes several studies that rely on innovative research designs using observations of simulated couple encounters with their newborn, represented by a life-sized infant doll. The book concludes with a review of recent prenatal intervention programs designed to improve interpersonal and coparenting relationships of married and unmarried couples. The volume offers recommendations for future research on prenatal family dynamics, including suggestions for methodological advances, exploration of prenatal risk factors, expansion of conceptual models to incorporate culturally-meaningful coparents besides mothers and fathers, and further focus on prenatal intervention programs. This book is an essential resource for researchers, clinicians and professionals, and graduate students in the fields of infant mental health/early child development, family studies, pediatrics, developmental psychology, public health, social work, and early childhood education.