Models relating to the participation of children are often explicitly aimed at facilitating or evaluating participation in decision-making processes on local levels. However, these models often build on hierarchically ordered ‘ladders’ of children’s involvement starting with passive involvement and increasing gradually to highly active engagement. Such models become problematic when designing or evaluating participative activities for young children. On the basis of two ethnographic studies conducted in children’s libraries, we propose an alternative model based on a view of participation as processual rather than definitive. Theoretically, the paper draws mainly on human rights theory as well as on theories and concepts derived from childhood studies such as participation and citizenship. The new model of participation demonstrates how the idea of participation can be operationalized at practical levels to include the very youngest children.