From The Pregnancy Bible by Joanne Stone, MD and Keith Eddleman, MD:
"Growth is very rapid this week. [Our] baby might look like a tadpole, with his curved back and tail, but he now has a brain. His tiny heart is no bigger than a poppy seed, but it is beating on its own. Other major organs, including the kidneys and liver, continue to develop, and the neural tube, which connects the brain and spinal cord, closes. [Our] baby's head now begins to take shape.A rudimentary digestive tract begins to form, together with the abdominal and chest cavities and the backbone. What will eventually become the testes or ovaries appear as a cluster of cells. Rudimentary arms and legs appear as tiny buds on the body. [Our] baby now has his own bloodstream, which has started to circulate blood."
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