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Secondary curvatures are the curves in the spine that develop after birth (when a baby starts to hold its head up).
Thoracic and sacral curvatures are the primary curvatures
cervical and lumbar
Wiki User
∙ 11y ago
Wiki User
∙ 13y agoThe cervical curvature forms after birth, approximately when the baby begins to lift his or her head. The lumbar curvature forms after birth, approximately after the baby begins to walk.
Wiki User
∙ 14y agoThe cervical curvature becomes prominent as a baby begins to hold its head up independently, and the lumbar curvature developes as the baby begins to walk.
Wiki User
∙ 12y agothe thoracic and sacral regions are primary and cervical and lumbar regions are secondary
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