During childhood, the development of postural control is a continuous process. Physical activity during this stage offers opportunities for learning, practice, and the development of motor skills. Among these skills, balance holds particular importance as it influences daily activities, participation in sports, and overall physical functioning in children. The central aim of this study is to determine whether disparities in balance exist between physically active and inactive children, while also evaluating the impact of sports engagement on balance development. The study encompassed 65 participants, comprising 40 (61.5%) physically active children and 25 (38.5%) physically inactive children. All participants were girls aged 8 to 10 years old. The physically active group engaged in regular sports activities beyond their routine physical education classes. Various aspects of balance, including static and dynamic balance with eyes both open and closed, were subjected to analysis. The findings revealed statistically significant differences in the results of the balance tests between physically active and physically inactive children (p ≤ 0.05), substantiating the initial hypothesis. Evidently, physically active children demonstrated superior balance capabilities compared to their physically inactive counterparts. These results also substantiate the hypothesis that organized physical activity significantly influences balance development in children aged 8 to 10 years (d = 0.84). Consequently, this study highlights the pivotal importance of physical activity in fostering optimal balance development in children.