In 2012 the Spanish government implemented the Royal Decree Law 16/2012 by which undocumented migrants are denied free access to the Spanish healthcare system. In the midst of unemployment, poverty and cuts in social protection, undocumented migrant women are facing multidimensional exclusions whereby austerity measures are having different consequences for women, especially for those who bear the greater brunt of caring roles in the form of mothering. Drawing upon qualitative research in the form of semi-structured interviews in Madrid, this article examines the structural vulnerabilities of undocumented migrant mothers and analyses the gendered processes that provoke them. At a time in which the borders of Europe are reinforced and internal political and economic tensions question this fortress, migrants become shock absorbers for national anxieties. The article argues that the Royal Decree Law, following neoliberal discourses of citizenship and social rights and saturated by patriarchal normative understandings of women’s place in society and care, turns undocumented migrant mothers into disposable and invisible reproductive bodies deprived of rights.