Pregnancy Calander >> WEEK 5
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Until now, the embryo has been a mass of cells, but by this point in your pregnancy a distinct shape begins to form. The neural tube, which will eventually form into the spinal cord and brain, runs from the top to the bottom of the embryo. A bulge in the center of the embryo will develop into your baby's heart. At this time, the placenta develops. It is through the placenta and its fingerlike projections, called chorionic villi, that an embryo receives nourishment from its mother.
 


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