At what age does the normal curve of the lumbar spine take place?

The normal curve of the lumbar spine develops during early childhood, specifically between the ages of 1 to 2 years. This is a critical period for spinal development, as the lumbar lordosis, which is the natural inward curve of the lower back, begins to form as the child transitions from a crawling stage to walking. This change in posture requires adaptations in the spine to support the increased weight bearing and allow for upright locomotion.

At birth, the spine is typically in a "C" shape with no curves, which is characteristic of a fetal position. As children grow and start to engage in activities such as standing and walking, the spine undergoes significant morphological changes. By around 1-2 years, these changes lead to a more mature lumbar curvature, reflecting the normal biomechanical function of the spine.

Adolescence is too late in development for the establishment of the lumbar curve, as the primary curves (thoracic and sacral) and secondary curves (cervical and lumbar) are generally established by early childhood. Similarly, the lumbar curve does not take shape at birth or at age 5, as the pivotal spinal motor milestones and muscle development necessary for this curve have already progressed by then.