This case study shows how the mayor of Lima, Peru, directed the metropolitan government’s Social Development Department and a small interdisciplinary team of architects and social scientists (1) to identify lessons learned from pilot projects, (2) to establish new ways of assisting infants and young children, and (3) to coordinate to get the job done. When the Covid-19 pandemic broke out in the capital city in 2020, the metropolitan government and its team continued this work.