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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: 受精後 21 ~ 22 週までには 肺は 空気を取り込む能力を ある程度備えています これにより 子宮の外での生存が 胎児によっては可能となるので この時点を生育可能な 年齢とみなします

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