Assertion: vertebral column's curvature | /r/HasProperty | accentuated in infancy
Facets:
value: by support of the head
type: MANNER
Source sentences:
text: The thoracic and sacral curvatures, termed primary, appear during the embryonic period proper, whereas the cervical and lumbar curvatures, termed secondary, appear later (although before birth) and are accentuated in infancy by support of the head and by the adoption of an upright posture.