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There are 5 groups in the vertebral column. In order they are called

1) Cervical

2) Thoracic

3) Lumbar

4) Sacrum

5) Coccyx

The 4th group contain 5 bones and once you are in the adult phase, roughly at about 26 years, the 5 bones fuses into one bone which shrink the number of bones the vertebra column have but but does not lose in size.

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Q: Why does the vertebrae column of an adult have fewer vertebrae than that of a newborn child?
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