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Parentpedia
Bones
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Parts of your baby's skeleton begin forming within the first few weeks after conception. By the end of the eighth week, the skeletal pattern is formed, though it is made up of cartilage and connective tissues. Ossification -- or bone formation -- begins in earnest around this time.
Because bone is in part composed of minerals, some people think it is not a living material. But bone is composed of both living tissue and nonliving substances. Within the living portion are blood vessels, nerves, collagen and living cells, including bone-forming cells (called osteoblasts) and bone-eating cells (called osteoclasts).
Even though your baby's skull, arms, legs, fingers, and toes...
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Fetal Development - First Trimester
December 10, 2008
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Fetal Development - Second Trimester
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First Trimester - Third Trimester
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