This book comprehensively discusses both gestational diabetes and diabetes that pre-exists pregnancy (type 1 or type 2), highlighting conditions and complications that are expected to occur during and after pregnancy. The book focuses on clinical problems encountered in everyday practice, but also covers topics that contribute to a better understanding of the clinical issues (genetics, epigenetics, pathophysiology). Written by leading experts in various disciplines, the chapters draw on the authors’ experience to critically evaluate relevant data on diagnosing and treating the disease and provide guidance on the optimal approach in each specific situation as well as on how to decide between alternatives. A series of learning objectives, tables, figures, algorithms and illustrations increase the book readability and help readers improve their understanding of the material. This book serves as a practical and useful tool for general obstetricians, fetal-maternal specialists, endocrinologists, diabetologists, neonatologists, midwives and for anyone involved in the management of pregnant women with this condition.