In this article, the authors reflect on co-occurrence of different types of maltreatment that adolescent mothers have suffered during their childhood in order to better understand intergenerational transmission of maltreatment. They underline that studies on maltreatment that adults or adolescents have been subjected to during their childhood generally do not take into account co-occurrence of different types of maltreatment. The authors first attempt to verify if adolescent mothers are different from women of the general population in regards to prevalence and co-occurrence of various types of maltreatment suffered during their own development. They then try to establish prevalence and co-occurrence of types of maltreatment in relation to diagnoses of major depression or conduct disorder in adolescent mothers.