This paper describes a study exploring the parental response to the diagnosis of their child's developmental disability. A classic grounded theory methodology was used to analyse data comprising 19 interviews and 11 memoirs written by parents. The theory explains how parents adjust to champion their child, who has been identified as having a developmental challenge. At the heart of becoming a champion is a psychological process in which parents refine their perspectives on disability awareness, their aspirations and parenting capacity as they develop their championing skills. Refining perspectives and championing are influenced by two factors: the nature of the child's challenges and service factors. The theory of Confident Championing offers a multivariant model that explains the dynamic nature of the adjustment process, capturing both the stress and the fulfilment and sense of purpose that parents experience.