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At which age does the ossific nucleus of the femur appear?: A guide to infant bone development

Bone development is a complex and highly regulated process, with the femur being a critical indicator of skeletal maturity in infants. Typically, the secondary ossification center of the femoral head begins to form during the first year of life. So, at which age does the ossific nucleus of the femur appear, and what do parents and pediatricians need to know about this important developmental milestone?