It has been shown that in the 7-10-year-old Magadan girls and boys, there is a reduction in the proportion of mesosomatics and an increase in that of micro- and macrosomatics. The proportion of children with disharmonious physical development substantially increases by age of 10 years, which negatively affects at the level of somatic health. Analysis of body mass index data shows that fewer girls have the average body mass indices with its values being less and higher than the average ones than the boys.