Fathers matter enormously for children and for early childhood development. Yet women around the world still do 3 times as much child care and unpaid domestic work as men do. Research, programs, and advocacy undertaken by Promundo and the MenCare Campaign, including the "State of the World's Fathers" reports, have demonstrated the promise and efffectiveness of well-designed policies, laws, trainings, and other approaches to achieve true equality in care work around the world, and in so doing to help all children and societies achieve their fullest potential. This article presents an overview of this evidence, including recommendations for achieving the goal of equality in care work.