Gender stereotypes established early in childhood have a profound impact on a child's sense of self-definition: they commonly influence behaviours regarding academic pursuit and career aspirations. The aim of the current study was to investigate the emergence of explicit and implicit gender stereotypes in children aged 5-8 years. Fifty-four children were recruited from a primary school in Manchester, United Kingdom. Four occupations (scientist, nurse, athlete, singer) and their corresponding personality traits (intelligence, empathy, athleticism, confidence) were examined. Explicit bias was measured using a forced-choice preference task. Implicit bias was measured using the Implicit Association Test. Binomial tests showed that explicit biases emerged amongst the youngest of pupils. Using a Four-Way ANCOVA, it was found that both boys and girls showed an implicit preference for males towards the Athlete domain only. These findings were discussed with reference to a sociocultural perspective through Social Learning Theory, and a cognitive framework through Gender Schema Theory.