Chapter 6 employs Welby’s Meaning Triad to investigate whether the boundary for the beginning of girlhood should be clearly identified in the international legal framework. It studies the definitions of child under international law and in the English language to assess whether they establish a beginning point for girlhood. It conducts two case studies concerning, respectively, the practice of prenatal sex selection and the right of young and adolescent girls to a safe abortion, to illustrate the significance for girl children of the current boundary for the beginning of girlhood under international law. It studies the sense, meaning and significance of provisions in the Convention on the Rights of the Child (CRC), the International Covenant on Civil and Political Rights (ICCPR) and the Convention on the Elimination of All Forms of Discrimination against Women (CEDAW) and refers to their respective travaux préparatoires.