Spontaneous trait inferences are trait inferences that are made without intention or conscious awareness on exposure to trait-implying behaviors. Most studies in the area of spontaneous trait inferences have been undertaken with adults, but little attention has been paid to the developmental course. Using a recognition probe paradigm, the current study was performed to examine the development of Chinese children's spontaneous trait inferences, comparing 8-, 9-, 10-, 11-, and 12-year-olds. Results indicated that children could infer traits from trait-implying behaviors spontaneously from the age of 8 years. Moreover, the strength of spontaneous trait inferences peaked at age 10 years, and decreased steadily from ages 10 through 12. These results suggest developmental changes in the tendency to engage in spontaneous trait inferences.