This article examines several key aspects of maternity homes for ‘unwed mothers’ in order to understand the overwhelming phenomenon of single mothers giving up their babies for adoption in South Korea and its naturalization as a common practice. Drawing upon Foucault’s concept of biopolitics, this article recasts maternity homes as an institution of biopolitical welfare and highlights two features of social governance that the maternity home extends over the population of single mothers and their children. First, I argue that this (...) unique, non-governmental social service agency functions as a hub of biopolitical technologies, where multiple social, legal, economic, and political forces work in concert to curb single motherhood through the promotion of adoption via (1) containment, (2) classification, and (3) circulation. Second, attending to the intricate dynamics of maternity home practices, this article observes the ways in which a single mother relinquishes her motherhood via adoption and, in so doing, becomes a birthmother, a self-regulating and self-governable subject. (shrink)