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Tay-Sachs disease is a rare genetic disorder that progressively destroys nerve cells (neurons) in the brain and spinal cord. The most common severe type, known as Infantile Tay–Sachs disease , becomes apparent around three to six months of age with the baby losing the ability to turn over, sit, or crawl. They also develop an exaggerated startle reaction to loud noises. An eye abnormality called...