This article describes some progress of a broad ethnographic study of the ways of regulating young women’s bodies and sexualities. It focuses on disputed meanings of young motherhood and abortion in the implementation of social policy for teenagers in the Buenos Aires metropolitan area. I will introduce some aspects of the ways some behaviors are constructed as legitimate, and others as illegitimate for young mothers. The purpose is to explore how said categorical construction, produced in everyday implementation, intersects with ideas about their sexualities and the ways in which gender, age and class shape that construction.