Gender, as a topic of study in psychology, can sometimes be treated as a messy inconvenience for researchers who would rather focus on illuminating universal laws of human behaviour.Developmentalists have been no less guilty of this approach than many others. Yet, gender is a topic thatwill not go away, and it will not disappear because it is a ubiquitous and fundamental part of any child’s development. As such, it is hard to imagine how a child can ever develop without gender influencing her behaviour, thinking, or social relationships. Therefore, developmental psychologists should be interested in gender because research demonstrates that from a young age children react to their own and others’ gender and think about gender in complex, su...