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The Endowment for Human Development
The Endowment for Human Development
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5 months

From The Biology of Prenatal Development.Buy Now

Script: 5 ヵ月

20 週までには 聴覚器官である うずまき官が 大人の大きさに達します 内耳もその頃には 完全に発達しています この頃からは 胎児は 幅広い音に対して 反応するようになります

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