Obesity is one of the leading public health issues of today. It represents a state at which excess of body fat reaches the ratio which affects the person's health. When it comes to the types of obesity, a person can differ between two types - primary and secondary. Body mass index (BMI) represents the ratio between body weight in kilos and square body height in metres. With its help we can determine overnutrition of a certain person. Position in percentile shows the position of a child inside his age group while relative weight points out on deviation from the ideal weight; and it is determined on the basis of real weight and height of a child. A small scale research has been conducted with a goal to determine the connection between overnutrition of a child and his or her habitat. Children from kindergarten Sesvete show higher levels of overnutrition than the children from the kindergarten Sesvetska Sela. It is assumed that higher level of overnutrition happens to children who live in urban surroundings, who are less physically active, who eat fast food and on whom the media effects the most. Obesity is caused by various genetic, environmental, psychological and psycho - social factors as well as an unhealthy way of living. The consequences are pyscho - social and they can also lead to different diseases caused by corpulence. Obese children, who don't demand special psychological treatment is crucial to teach the proper way of nourishment and physical activity. Secondly, when it comes to children who have additional complications, main goal is to reduce those complications. At preschool age, children are supposed to be introduced to various sport activities in order for them to create certain crucial values about the healty way of living. Connection between family, kindergarten/school and the social community is extremely important because without is children would not be able to improve the status of their physical activity nor of their dietary habits.