[영문]This article presents an emergent conceptual model of childhood adultification and economic disadvantage derived from 5 longitudinal ethnographies of children and adolescents growing up in low-income families. Childhood adultification involves contextual, social, and developmental processes in which youth are prematurely, and often inappropriately, exposed to adult knowledge and assume extensive adult roles and responsibilities within their family networks. Exemplar cases from the ethnographies are integrated in the discussion to illustrate components of the model. Four successive levels of adultification are described: precocious knowledge, mentored-adultification, peerification/spousification, and parentification. The developmental assets and liabilities children incur also are discussed. Recommendations for school, health care, and social service practitioners working with low-income families and children are provided