This study investigated the relationship between executive function development and cost-related information-gathering behaviour in early childhood. Fifty-six children aged 4-6 years completed an information gathering task, a black-and-white inhibitory task to measure inhibitory control measurement, and a backward word span task to assess working memory. In the information gathering task, children participated in non-cost and cost conditions, where they could freely gather information or incur a cost of one sticker per piece of information. Results showed that children with higher inhibitory control gathered less information when a cost was involved. This suggests that inhibitory control plays a crucial role in shaping information-seeking behaviour in the presence of explicit costs. These findings highlight the importance of executive function development in understanding how children consider costs in their decision-making processes.