This series of briefs draws on the findings of multi-country research based on first-hand migration experiences of 1,634 children and young people moving between Somalia, Ethiopia, Sudan and Egypt1 (available at www.unicef-irc.org/child-migration-hoa). The briefs highlight findings that can inform decision makers when designing child-sensitive solutions for children on the move (COM), in line with relevant objectives of the Global Compact for Safe, Orderly and Regular Migration (GCM). This first brief in the series presents strengthening child protection systems and ending child immigration detention. [For Brief 2, see ED620510. For Brief 3, see ED620509.]