<![CDATA[Background: The period from birth to five years of age is known as the golden period, a crucial phase for a child’s growth and development. During this stage, developmental monitoring—particularly of cognitive aspects—is essential as a foundation for the child’s future. Tactile sensory play is one form of stimulation that contributes to infants’ cognitive development. A lack of stimulation may hinder this development. Objective: To determine the effectiveness of tactile sensory play on the cognitive development of infants aged 12–15 months in Mekar Sari Village, Deli Tua District. Method: This study employed a quantitative design using a quasi-experimental approach with a one-group pretest–posttest design. The sample consisted of 30 respondents selected through accidental sampling. The tactile sensory play intervention was administered three times. Data were collected through observation using observation sheets and analyzed using a t-test with SPSS software. Results: The t-test results showed a p-value of 0.000 (p < 0.05), indicating a significant effect of tactile sensory play on the cognitive development of infants aged 12–15 months in Mekar Sari Village, Deli Tua District. Conclusion: Tactile sensory play is effective in improving the cognitive development of infants aged 12–15 months.]]>
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