One of the most important achievements of infancy is mobility, through which the child gradually becomes independent and can discover new places and objects. One form of mobility that occurs in a child's development is rolling over from supine-to-prone.The assumption of the work was to check whether all particular motor elements from the 3rd month had a comparable effect on development in the 6th month of life.The study population included 119 children, 69 born at term, and 50 born preterm. Children were born at week 38 ± 3 (born at term 40 ± 1/preterm 34 ± 3), with a mean body weight of 3100 ± 814 g (born at term 3462 ± 505/ preterm 2282 ± 788). Pre-term children were assessed at the corrected age. The physiotherapeutic qualitative assessment at the age of 3 months was performed in the prone and supine positions, and the qualitative assessment included 15 elements in the prone position and 15 in the supine position. A detailed mathematical analysis was then performed. Values of Cramer's V coefficient with confidence range, Goodman-Kruskal's coefficient, and the values of the probability coefficient p were given.The position of the scapulae and pelvis (3rd month) had the strongest impact on achieving proper support on the upper extremities in the 6th month of life, while the supine position was most significantly affected by the position of the head, spine, and pelvis.
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