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2. Mobility

Not only does the umbilical cord serve as the vital connection for oxygen and nutrients, but it is also structured in a way that allows the fetus to move around in the womb. It is mechanically strong yet flexible enough to promote neuromotor development. The umbilical cord begins to form around the fourth week of pregnancy and grows to about 22 inches

over the subsequent months.

Baby Cord Anatomy kontiki / Getty Images
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