Early childhood development is crucial for children’s growth and long-term outcomes. In Peru, the government has made investments in education and health, aiming to support child development programs. However, more work is needed in other areas to ensure all children can thrive. This paper explores the potential of interventions in the built environment as a relatively unexplored area that could benefit child’s development. We present the implementation of the ‘Safe Route to the “Mercedarias” daycare’ project as a successful experience for promoting child-friendly cities. The project involved collaboration among mid-level officers and frontline workers within a large municipality’s organizational structure. The strategies we used allowed us to build a working group willing to collaborate on further projects. The process was successful without requiring additional expenses b...