Child sexual abuse has been discussed thoroughly; however, marginalized groups of victims such as victims of child sexual abuse in early childhood and victims of maternal sexual abuse have rarely been considered. This essay combines these two relevant perspectives in child protection and aims to pin out future directions in the field of child abuse and specifically maternal sexual abuse and its early prevention. In the course of the 7th Haruv International PhD Workshop on Child Maltreatment at the Hebrew University, Jerusalem, in 2019 the topics of maternal sexual abuse and early prevention of child maltreatment in Germany were discussed and intertwined. Problems concerning the specific research of maternal sexual abuse in early childhood and prevention were identified. Both, maternal sexual abuse as well as sexual abuse in early childhood, i.e. before the age of three, are underreported topics. Society still follows a “friendly mother illusion” while recent cases in German media as well as research findings indicate that the mother can be a perpetrator of child sexual abuse. Similarly, sexual abuse in early childhood, namely abuse before the age of three, is existent; although the recognition of it is difficult and young children are, in regards to their age and development especially vulnerable. They need protective adults in their environment, who are aware of sexual abuse in the first years of life. Raising awareness on marginalized or tabooed topics can be a form of prevention. An open dialog in research and practice about the so far marginalized topics of maternal sexual abuse and sexual abuse in early childhood is crucial.