Roo is no longer an embryo! Though she’s barely the size of a kumquat — just an inch or so long, crown to bottom — and weighs less than a quarter of an ounce, she now has completed the most critical portion of her development.

 

This is the beginning of the so-called fetal period, a time when the tissues and organs in her body rapidly grow and mature. Her vital organs — the liver, kidney, intestines, brain, and lungs — are now in place and starting to function (although they’ll continue to develop throughout pregnancy).

 

Her liver continues to make blood cells, and the yolk sac, which previously supplied these cells, is no longer needed and begins to disappear.

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