The new edition of Migration Policy Practice, guest-edited by Gabriella Sanchez from the Migration Policy Centre at the European University Institute, focuses on issues of child migration. It seeks to respond to the Call to Action launched earlier this year by UNICEF, the International Organization for Migration (IOM), the Office of the United Nations High Commissioner for Refugees (UNHCR), Eurostat and the Organisation for Economic Co-operation and Development (OECD) to prioritize actions to address evidence gaps in children’s migration data.