The Policy Research Working Paper 10765 examines the human development gaps between forcibly displaced migrant and host children and adolescents, focusing on cognitive and socioemotional skills and physical and mental health. The study uses a unique and comprehensive longitudinal data set of around 2,500 Venezuelan migrant and Colombian host children and adolescents, ages 5 to 17 and living in Medellín, Colombia. The findings reveal significant developmental delays among migrant children in physical and cognitive skills, as well as lower socioemotional skills and higher rates of mental health issues. The study also explores how access to services and regularization programs are correlated with these disparities.