This article discusses the problems associated with an important component of the health of the younger generation – its development and level of fitness, the decrease in the informative value of indicators of physical development with age, as well as with the increase in the level of physical fitness. There is also a functional indicator of the level of physical fitness of young children (heart rate, heart rate, lung vitality, circulatory system, central nervous system, musculoskeletal system), which, due to its objectivity and universality, has been widely distributed over the past 30 years. But in recent years, there have also been those who question the informativeness of these criteria. At the same time, it was proposed to use for these purposes the installed capacity and the amount of work performed, as well as the time limit for maintaining the pulse characteristics of homeostatic control voltage, as well as the availability of standards in the form of nanograms of physical development of primary school children of the Ferghana district, the essence of centile nanograms, which, on the one hand, reflect the relationship between the leading antrometric signs., on the other hand, their combinations can be used to judge the harmony of the physical development of this category of children.