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The Endowment for Human Development
The Endowment for Human Development
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Age of Viability


5 months, 1 week

From The Biology of Prenatal Development.Buy Now

Script: 到受精后的21至22周 肺脏获得一些 呼吸空气的能力。 这被视为 生存能力时期 因为一些胎儿可能 在子宫外生存。

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