This paper investigates the relationship between children's clothing color and gender stereotyping, as well as the underlying mechanisms. Sample colors were chosen based on their representativeness and prevalence, and characterized using the HSB (Hue-Saturation-Brightness) color model. Through sensory experiments, it is found that most colors have varying degrees of gender association. The paper explores the general principle of how gender stereotyping is induced from the perspective of the CMY color theory and analyzes the relationship between color brightness, saturation, and gender stereotyping by establishing regressional models. It is also found that the formation of gender stereotypes in children's clothing is related to people's different expectations for the temperament and behavior patterns of children of different genders through perceptual experiments. Understanding the gender tendencies conveyed by colors can offer designers guidance in the application of colors when creating products targeted at specific markets characterized by different gender cognitive inclinations. Besides, the findings of the study will inform future research in the fields of clothing psychology and children's gender cognition education.