Several important societal issues and corresponding areas of enquiry within the social sciences concern children. The UNCRC demands that decisions about children rest on solid, up-to-date evidence and guarantees their right to be heard. Participatory research furthers this by involving children as active contributors or so-called co-researchers. However, appropriate children’s participation depends on the study’s questions and epistemological framework, requiring developmentally sensitive methods that honour their cognitive and socioemotional maturity to ensure meaningful engagement and genuine insight. The insights gained from participatory research contribute to a more nuanced understanding of children’s participation beyond legal rhetoric, highlighting the everyday interactions and institutional practices that shape children’s experiences. The focus of this chapter is children’s participation in research through participatory research forms. The chapter problematizes and discusses  whether and how participatory research approaches may enhance the quality, relevance, and applicability of findings, contributing to trust in scientific knowledge production.