6 weeks - iVillage

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Getting Ready

Trying To Conceive

Am I Pregnant?
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Sonograms Week-by-Week: Your Guide to What's Going On in There!

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FHC; Science Photo Library

a on May 5, 2010 at 10:42PM

Just a week later the embryo is now visible to the naked eye via ultrasound, as is the yolk sac that will cushion it for the next 34 weeks. Even though you can’t see it, your baby’s brain is also growing. In fact, before she’s born, her brain will form over 100 billion neurons (the basic building blocks of the nervous system).