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The circulatory system is beginning to form, and the tiny "heart" will start to beat this week.
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Your baby's nose, mouth and ears are starting to take shape, and the intestines and brain are beginning to develop.
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Little hands and feet that look more like paddles are emerging from the developing arms and legs.
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Nerve cells are branching out, forming primitive neural pathways. Breathing tubes now extend from his throat to his developing lungs.
