Throughout history and systematically, the voices of children and adolescents have been ignored in the spaces of construction of public mental health policies, despite representing the age group most affected. The objective of this case study was to analyze the participation of children and adolescents in the construction of the mental health route in La Guajira, Colombia A co-productive methodology framed in Participatory Action Research was adopted, highlighting its collaborative and dynamic approach. Focus groups were established and thematic analysis was implemented to deepen the understanding of participants' experiences and perspectives. In the focus group made up of children and adolescents, meanings, barriers and recommendations were identified, which later formed part of a district decree. The need to be heard from their autonomy and their moments of development is highlighted, to integrate mental health into daily life beyond health services, to strengthen ties and support networks, to have safe spaces to express their needs, and receive a comprehensive, sensitive and continuous approach. The core components highlighted in the creation of the mental health route start from the construction of a safe and trusting environment This study highlights the need to realize the right to participation of children and adolescents in public policy.