This paper describes how a child's development can be monitored and what all affects the maintenance of body weight in children. The aim of this paper is to show what educators and parents must do to change this negative trend of increasing the number of obese children. In order to determine the child's level of nutrition, it is necessary to conduct anthropometric measurements at the beginning and end of the pedagogical year. Such an approach allows us to detect overfed children, obese and malnourished children who need to change their life habits. Physical activity in kindergarten through play and in physical education and health classes, and activities in the orphanage are the key to the fight against obesity. It is an increasingly common sight for children to stare motionlessly at their cell phones and tablets instead of spending time playing with their peers. Physical exercise has many positive effects on a child's health in the context of disease prevention, but it also contributes to children's socialization and cognitive development. In addition, children need to be offered a varied diet that will meet all their nutritional needs. Eating habits are acquired from an early age, which means that parents must watch what their children eat, but they should also be a model for their children by eating healthily. A study was conducted in the Trnsko Kindergarten in which 30 children participated, and the degree of nutrition in children was determined using the body mass index and the percentile. The results showed that four children were obese, and a higher percentage of boys fell into that group. In addition, it has been found that most children consume sweets on a daily basis which negatively affects their body constitution.