A parent spends most of the time with the child, so the child learns from them about healthy diet and takes them as an example. It is necessary to know which food in the pyramid of proper nutrition contains proteins, carbohydrates, vitamins, minerals and fats. It also contains the quantity one should take. The lack of parental knowledge about healthy eating habits leads to the fact that they don't provide enough food for growth and proper development. The child won't be able to develop properly, which may also result in some disease, like obesity. Apart from nutrition, it's also important to pay attention to physical activity, which greatly affects the child's weight and it makes the child stronger. By acquiring the habit of physical activity the quality of child's growth will be better. The aim of this research is to find out how much the parents are informed about the most appropriate diet for pre-school children, and whether they provide it for them. In the research, the questionnaire was used as a measuring instrument. It was applied on the sample of 105 parents of pre-school children. The questionnaire consists of 23 questions where the parents' knowledge about the child's diet was tested, as well as about the main components of a meal and its influence on the organism and the child's participation in the physical activities. The results show that more than half of the parents are well informed about healthy eating habits and they encourage their children to eat healthy, whereas there are still some parents that need education in order to influence the quality of their child's growth and development.