Book excerpt: Compassionately written by an experienced team of professionals, this book offers parents and families essential information about the causes, diagnosis, and treatment of disorders of sex development, or DSD. DSD refers to medical conditions, usually discovered at birth, in which there is disagreement between a person's genetic sex (i.e., chromosomes) and the appearance of the person's external or internal reproductive structures. After their child is diagnosed with DSD, parents need answers to a host of questions, including ? What is DSD, why does it occur, how is it identified, and how is it treated?? Did we do something to cause our child's DSD?? Is my baby a boy or a girl?? Will my child grow up to be normal and healthy?? Does my child need surgery? This concise book answers parents' questions in a reassuring and forthright way, giving affected individuals, their families, and their health care providers a current and evidence-based picture of DSD. It offers clear explanations of how newborns with DSD are evaluated, diagnosed, and treated; describes the different kinds of DSD; and pays close attention to both psychosocial and medical aspects of DSD. This guide also includes information about the importance of support groups and education for affected individuals and their families. In their daily work, the authors treat, support, and educate people with DSD and their families. This resource gives parents and families access to the authors' expertise so they can reach a meaningful understanding of their child's DSD and make informed decisions about their child's health.