It is widely recognised that trauma-informed care is fundamental to meeting the needs of children who experience residential care. Service design is central to this, and the aim of this article is to illustrate the experiences of 13 young people who have lived within group care settings, to highlight how a service’s capacity can impact on children’s needs being met. Using findings from a PhD thesis engaging 18–29-year-olds in Scotland, the research used a mixed methodological approach of questionnaires and semi-structured interviews to elicit young people’s retrospective care experiences. The findings show that the number of children within a setting can adversely affect the feeling of being emotionally and practically supported, resulting in some children feeling that their needs were not fully met. This will offer insight to practitioners, managers and decision makers who are engaged in the delivery and development of children’s services. Background: The United Nations Convention on the Rights of the Child (UNCRC) articles 3, 9 and 20 and Scotland’s Independent Care Review state what children should expect from authorities and services responsible for providing alternative care. The ambition for Scotland’s children is that they “grow up loved, safe, and respected so that (they) realise their full potential”. For those who spend a period of their childhood growing up in residential care, they should experience a relational, trauma-informed and caring approach from staff.