This second edition offers an expanded and updated history of the field of fetal and neonatal development, allowing readers to gain a comprehensive understanding of the biological aspects that contribute to the wellbeing or pathophysiology of newborns. In this concluding opus of a long and prominent career as a clinical scientist, Dr. Longo has invited new contributions from noted colleagues with expertise in various fields to provide a historical perspective on the impact of how modern concepts emerged in the field of fetal physiology and contributed to the current attention paid to the fetal origins of diseases in adults.  In addition to new chapters on maternal physiology and complications during pregnancy, others trace the history of the Society for Reproductive Investigation, governmental funding of perinatal research, and major initiatives to support training in the new discipline of maternal fetal medicine, including the Reproductive Scientist Development program. The extensive survey provided by the author, who personally knew most of the pioneers in the field, offers a unique guide for all clinical and basic scientists interested in the history of – and future approaches to diagnosing and treating – pathologies that represent the leading causes of neonatal mortality and, far too often, life-long morbidity.