advocates a critical developmental approach aimed at countering the cisgenderism that can be perceived in previous developmental literature on gender. It clears a path to understanding gender development for transgender young people by providing a detailed account that spans early childhood through to late adolescence. In doing so, it demonstrates how clinicians can work more effectively with parents and other family members in order to affirm transgender young people. By outlining a GENDER mnemonic created by the author, the book provides worked through examples of case materials that highlight the benefits of a critical developmental approach. Offering unique insights and practical guidance, it provides a cutting-edge resource for clinicians and researchers, as well as for families and other professionals seeking to understand and work affirmingly with transgender young people.