This paper reports from a study exploring how an increased knowledge about gender issues can affect pre-school student teachers’ reflections and actions concerning science and technology activities. We have analysed written assignments given to student enrolled in a teacher education programme as well as group discussions that were part of their science and technology courses. One assignment was focused on describing situations during their pre-school placements where the students themselves judged gender to be important. The analysis identifies a reoccurring argumentation among the students that draws on an idea that children need to ‘be who they are’, thus portraying them as having a stable core identity. In this paper we ask what it means to let the children ‘be who they are’ and what the consequences of this view for developing the pre-school according to the curriculum and the education act can be. In doing so, we discuss issues that respectively may promote and hinder pre-school teachers to develop strategies that challenges stereotypical gender patterns. Furthermore, we problematize what consequences this might have for science teaching.