 This systematic review and meta-analysis provides strong evidence that parenting interventions can have beneficial effects on child cognitive, language, motor, and socio-emotional development, as well as parenting outcomes such as parenting knowledge, practices, and interactions. The results suggest that these interventions may be particularly beneficial for children living in low and middle income countries. This article was authored by Joshua Jong, Emily E. Franchett, Clariana V. Ramos de Oliveira, and others.