In connection with the spread of undifferentiated forms of connective tissue dysplasia (UCTD) in unfavorable climatogeographic and environmental conditions, it seems relevant to assess the impact of organogenesis disorders on physical development in schoolchildren living in the northern region. Based on the foregoing, the purpose of this study was to study the relationships and interdependencies of the components of physical development and somatometric indicators in children of the northern region with phenotypic signs of connective tissue dysplasia. Anthropometric indicators were revealed that can be used for express diagnostics of the level of physical development in children with UCTD – these are the length of the legs, the thickness of the skin-fat fold on the front surface of the shoulder and the interorbital-circumferential index. When assessing covariants such as age and sex, there is a correlation of clusters of long-length values with age, the relationship of the thickness of the skin-fat folds with the floor, and the parameters assessing changes in the cerebral and facial skull, such as: face width, head circumference and interorbital-circumferential index are associated with both sex and with age. The influence of posture disorders on the studied components of physical development is manifested by higher growth in children with flat and round-curved backs, a decrease in the thickness of skin-fat folds and head size with a round and round-curved back. Thus, for a comparative analysis of gender and age differences in the level of physical development in children with UCTD, it is necessary to take into account the dynamics of interdependent anthropometric indicators and indices, taking into account postural disorders.