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The Endowment for Human Development
The Endowment for Human Development
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The Maturing Heart


6 weeks, 6 days

From The Biology of Prenatal Development.Buy Now

Script: 4個心室的心臟基本完成。 平均而言，現在 心跳每分鐘167次。

在7 1/2週記錄的電活動 顯示與成年人相似的波型。

All ages referenced to fertilization, not last menstrual period.
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Nipple Formation
Nipple Formation
Hand Movement
Hand Movement
The Maturing Heart
The Maturing Heart
The External Ear
The External Ear
Hiccups & Startle Response
Hiccups & Startle Response
Joining Hands
Joining Hands
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