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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: 到受精後的21至22週 肺臟獲得一些 呼吸空氣的能力。 這被視為 生存能力時期 因為一些胎兒可能 在子宮外生存。

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