The aim of this study was to monitor the morphological characteristics of children in early school age, students of primary schools in the area of the island Krk, in order to determine their current status and possible differences in terms of age, gender and level of physical activity. Previous researches related to children in the early school age, their morphological characteristics and level of physical activity are gathered in this study. Health is very important. Numerous studies have addressed the conclusion that the appropriate physical activity is a very effective way of children’s development and health insurance. Modern society is characterized by insufficient physical activity that results in obesity. The results showed that children graduating in higher grade increase the value of their morphological characteristics. There are also noticed a significant differences according to gender in the index of obesity, skin fold thickness and index of sport. The boys showed significantly higher index of sport. The girls showed worse results in skin fold measures in all grades. According to the results, students who are less involved in sports are higher, they have a higher body weight and a higher volume of hips and forearms. They also have a lower index of obesity. Physical activity is extremely important for the development of an individual, especially in childhood when it can make a significant impact on physical development. Also, it can contribute to creating a positive image of healthy lifestyles and the acquisition of healthy habits.