Children and young people's (CYP) life chances depend heavily on family resources. This paper reports a rapid review of qualitative/mixed method studies about Universal Credit undertaken with CYP in the UK; subsequently expanded to include additional descriptors of economic disadvantage. Sixteen studies were reviewed; narrative synthesis was used to explore themes. Most recruited CYP with experience of economic disadvantage; none explicitly reported perspectives of CYP experiencing disability or rurality. Findings show growing up in poverty has significant, negative impacts on health and well-being, causing feelings of exclusion, shame and unfairness; raising important questions about the adequacy of welfare support in the UK.