Summary This article aims to argue and substantiate the dislocation of the human rights narrative with regard to the migrant girl detained in Mexico. To this end, it first theoretically explores the dislocation of human rights discourse towards migrants. Second, it analyses the construction of the human rights narrative of migrant children through three premises: (1) children are subject to law and require States to take special measures for their protection on account of their age; (2) all children, all rights; and (3) detention of children can only be carried out as a measure of last resort and absolutely exceptional. Third, it addresses the regulatory and practical dislocation of the human rights narrative of migrant children in Mexico. Fourth, it proposes three possible alternatives — in legal, practical and political terms — to articulate the human rights narrative of migrant children so that they can be used to protect them and assert their rights.