Introduction: during the infant development, the organ growth is influenced by genetic factors, diet, hormones and many neuropeptides. The secondary ossification center in the hip joint begins to form around the 4th month of life. Primary dentition begins at the age of 5-6 months with the emergence of the central incisor in the maxilla. At birth, 6 fontanelles are present between the plate bones of the cranium. The largest is the anterior or large fontanelle. Objective of our research is to analyze the development of the secondary ossification center in the femoral head in relation to dentition and closure of the anterior fontanelle closure as well as influence of childrens' birth weight and current weight on these processes. Methodology: The study included 284 infants, male and female, aged 3 to 8 months. Clinical examination of the musculoskeletal system, anthropomentric measurements and ultrasonographic findings of the hip joint were performed at the Pediatric Clinic of the Clinical Hospital Center Pristina in Gracanica. Results: The development of secondary ossification centre correlated with child's age, dentition, anterior fontanelle closure, birth weight and delivery method, as well as actual body weight. Anterior fontanelle size was inversely related to age, body weight and secondary ossification. Conclusions: According to regression analysis, body weight is the only factor that has a direct and independent impact on the onset and progression of ossification process. Every additional kilogram of a child's body weight accelerates secondary ossification by 1.3-3.77 times.

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