Objective : The purpose of this study was to investigate the sensory processing factors that contribute to the temperament and character traits in early childhood. Methods : In this cross-sectional study, caregivers of typically developing children aged 3–6 years responded to the Sensory Profile and the Junior Temperament and Character Inventory. Multiple regression analysis was performed with temperament and character traits as criterion variables and sensory processing quadrants as predictive variables. Results : Sensory sensitivity significantly predicted novelty seeking and cooperativeness. The high frequency of sensory sensitivity behavior was related to high novelty seeking and low cooperativeness. Conclusion : This study demonstrated that sensory sensitivity contributes to the novelty seeking temperament and cooperativeness character in early childhood.