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The Endowment for Human Development
The Endowment for Human Development
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Upper and Lower Limbs


3 months

From The Biology of Prenatal Development.Buy Now

Script: By 12 weeks, upper limb length has nearly reached its final proportion to body size. The lower limbs take longer to attain their ultimate proportions.

All ages referenced to fertilization, not last menstrual period. One month = 4 weeks.
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