This study aimed to examine the effect of cotton painting activities on the creativity of early childhood learners at RA Fajar Ummi. The study employed a quantitative approach using a quasi-experimental design with a one-group pretest-posttest model. The research sample consisted of 9 children selected through a total sampling technique. Data were collected through observation and documentation, while data analysis was conducted using the Shapiro-Wilk normality test, the Paired Samples t-Test to determine whether there was a significant effect, and Cohen’s d effect size test to measure the magnitude of the effect, with the assistance of IBM SPSS Statistics 27. The results showed that the Paired Samples t-Test yielded a significance value of Sig. (2-tailed) < 0.001 < 0.05, indicating that H₀ was rejected and Hₐ was accepted. Furthermore, Cohen’s d effect size value of 5.620 indicated a very large effect.
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