The authors conducted a scoping review of Early Childhood Education and Care (ECEC) interventions in economically developing countries between 1998 and 2017, aimed at improving children’s learning in the years before school. The review identified 37 parent-focused studies from 19 countries which provide an evidence base for parent-focused interventions that have both depth and geographical breadth. This policy note outlines characteristics of these interventions which contribute to changes in developmental outcomes for children. It found that of all ECEC interventions, the largest body of effectiveness evidence is available for parent-focused programs.