Here are some landmarks in the first 60 days of development (links are to PDFs,
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; save and open in Adobe Reader X or higher for interactive features):
Days 15-17: The embryo and all the membranes that surround it are no bigger than a speck of dust. The embryo itself is a speck within the speck, and consists of just three layers of cells. From these layers, all organs and body structures will form.
Days 19-21: What a difference a few days make. The embryo is now about the size of a pinhead and has laid the early groundwork for the heart, gut,
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, skin, muscles, skeleton and brain.
Days 21-23: A furrow of tissue that gives rise to the brain and spinal cord has now begun to fold together,
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, forming the neural tube. If the furrow doesn’t close properly, the spinal cord could protrude from the backbone, a birth defect called spina bifida.
Days 28-32: The embryo,
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, now at the half mini-chocolate-chip size,
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, starts to take on a textbook look,
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, fledgling head and lower body curled toward each other — a rough draft of the classic fetal position.
Days 35-38: Short paddlelike arms and the first nubs of legs have emerged,
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. The embryo is now almost the size of a ladybug,
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.

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