*The leading work in the field, thoroughly updated: 75% new material includes numerous new chapters, with 9 new topics. *New content includes chapters on rural health, international collaborations, and atypical sex development; expanded coverage of epigenetics, epilepsy, and spina bifida; and more. *Hot topic: pediatric health care systems are increasingly integrating psychological and medical care. *Concise, rigorously peer-reviewed chapters from leading experts. *Definitive: sponsored by the Society of Pediatric Psychology of the APA.