The new, fully updated edition of this successful book, brings together the combined experience of a leading dedicated unit over 25 years in delivering expert medical and surgical care to children with DSD (Disorders|Differences of Sex Development) in a holistic environment. It documents the most recent advances in the molecular biology and embryology of sex development, and describes each variation in detail. The main focus of the book is on patients with variations with their anatomy and hormone function. New chapters describe the developments in the field in terms of definitions and incidence, the mental health of DSD patients and discuss the perspectives of patients families and support groups. The clinical presentation and approach to diagnosis are described both for babies and for children presenting later in childhood or at adolescence. The chapters on management highlight all the latest knowledge and include the shared wisdom of the authors on current controversies, such as the timing of surgical treatment. Finally, the authors describe their short-, medium-, and long-term outcomes, which demonstrate the strengths of holistic team management.