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The Endowment for Human Development
The Endowment for Human Development
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Vernix Caseosa


4 months, 1 week

From The Biology of Prenatal Development.Buy Now

Script: 一种叫做胎儿皮脂的 保护性白色物质 现在覆盖著胎儿。 胎儿皮脂保护皮肤 不受羊水的 刺激影响。

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