By studying various reaserch and literature on physical activity and anthropometric characteristics of children, there was inspiration for the aim of this final paper and that was to determine whether there are differences in anthropometric characteristics considering the level of physical activity of children in Krapina- Zagorje County. It is constantly emphasized that the preschool time is crucial for the acquisition of habits, but also the proper growth and development of children and because of that, it is necessary to pay attention and importance to that period. In addition to the already mentioned main goal, the secondary goals of this reserach are to determine organized physical activity, compare active time with time spent in front of television or computer, to determine whether there are differences in variables according to gender and which factors affect physical activity the most. The sample consists of 35 children, of which 18 are boys and 17 girls aged 3 to 7 years. Data were collected through an online poll and then processed using descriptive analysis, t-test and Pearson's correlation coefficient, with anthropometric characteristics, physical activity and gender as variables. The results obtained by t-test showed that in the anthropometric characteristics and level of physical activity of children, there is only a statistically significant difference in the waist-to-hip ratio (WHR) and that is that boys have a higher WHR compared to girls. Pearson's correlation coefficient showed a positive moderate correlation in body weight and organized physical activity, and negative correlation was found in organized physical activity and WHR. Even in such a small sample, it is possible to notice the positive aspects of physical activity, especially in the WHR, so it is extremely important to try to prevent sedentary lifestyle and introduce as much physical activity as possible in childhood.