Bioethics has dedicated itself to exploring and defending both reasons for and against certain aspects of clinical care, biomedical research and health policy, including what decisions must be made, who should make them, and how they should be made. In pediatrics, it’s widely acknowledged that parents’ reasons may matter pragmatically; attending to parents’ reasons is important if we want to work with families. Yet the conventional view in pediatric ethics is that parents’ reasons are irrelevant to whether a decision is (...) permissible or impermissible according to accepted ethical standards. In this paper, we explore whether parents’ reasons matter ethically and, if so, in what way and for whom. First, we clarify what we mean by ‘reasons.’ Second, we provide an overview of how reasons are typically treated in medical decision-making and pediatric ethics. Third, we analyze a hypothetical pediatric case to illustrate how changing reasons can transform ethical analyses, including by contributing to where and how clinicians and ethicists draw the boundaries intrinsic to common pediatric ethical frameworks. We push back against the conventional view and argue that parents’ reasons matter ethically in several ways. We call for further research on the role of parents’ reasons in clinical ethics deliberation. (shrink)