Week 12

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Week: 12

 

This week marks a turning point for Roo.

 

The herculean task of developing new bodily structures is nearing an end as most of his systems are fully formed. Now comes the maintenance phase, during which the systems continue to mature for the next 28 weeks and the organs get to work.

 

Roo weighs as much as half an ounce now, and the crown-to-rump length is about two and a half inches (the size of a large plum — busily working his way through the whole produce department).

 

It’s hard to believe (especially from the outside, since Vic’s barely showing at this point), but Roo has more than doubled in size in the last three weeks!

 

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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.