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(1) Background: Contracting diseases or being exposed to adverse environmental factors in the first year of life may impair the development of body posture and motor coordination. The purpose of this study was to evaluate the correlation between data on the speed of passive verticalization, the number of risk factors and the quality of development in the first year of life, and the results of the functional examination of these individuals in adolescence. (2) Methods: Two groups of 60 volunteers, aged 9–14 years, were examined by performing functional tests and the retrospective analysis of their development up to the age of 1 year. The first group consisted of patients diagnosed with postural defects. The control group consisted of healthy people of the same age who volunteered for this study. (3) Results: Statistical analysis showed statistically significant differences between groups in terms of posture (p = 0.001), motor coordination (p = 0.001), and accumulated primitive reflexes (p = 0.001), as well as a high correlation between these disorders and the quality of development in the first year of life. In the first group, for the ages of 3–6 months (r = 0.96; p = 0.001), 6–9 months (r = 0.871; p = 0.001), and 9–12 months (r = 0.806; p = 0.001), no significant correlations were found with the age of 0–3 months. In the second group, the results were as follows: 0–3 months (r = 0.748; p = 0.001), 3–6 months (r = 0.862 p = 0.001), 6–9 months (r = 0.698; p = 0.001), and 9–12 months (r = 0.740; p = 0.001). In the group of adolescents with posture defects, we observed an earlier time of passive verticalization and sitting, as well as more frequent use of loungers, seats, and walkers (p = 0.026). (4) Conclusions: The analysis of this study's data indicates that the development of body posture and motor coordination may be impaired due to accelerated and passive verticalization in the first year of life. [ABSTRACT FROM AUTHOR]

Objective: Aim: This paper discusses the development of postural-motor, coordination, and reflex functions in children during their first year of life. It proceeds in an orderly manner in stages in which the child actively acquires new psychomotor skills (developmental milestones). These milestones are permanent and have a lifelong impact on health and fitness.., Patients and Methods: Materials and Methods: An analysis of data from literary sources on child development in the first year of life was carried out. The review was based on the PubMed online database using keywords related to child development in the first year of life, childcare principles, and infant rehabilitation. The discussion follows an orderly progression through stages where children actively acquire new psychomotor skills, known as developmental milestones. Attention has been paid to the balance organ, which plays a significant role in the development of brain coordination and the disappearance of primitive reflexes. The analysis revealed that the development of postural-motor, coordination, and reflex functions follows a predictable pattern. Key developmental milestones include the gradual disappearance of primitive reflexes and the acquisition of new motor skills. The balance organ plays a crucial role in brain coordination and motor development., Conclusion: Conclusions: Monitoring child development in the first year of life by specialists and guidance for caregivers is important to ensure optimal life-long physical and mental development. The dexterity and physique of an adult result from the harmonious course of development during the first year of life.