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Gratuit Down Syndrome: MedlinePlus About 1 in 700 babies are born with the birth defect known as Down Syndrome. Learn about the different Down Syndrome types and related health issues. Down syndrome Wikipedia Down syndrome (DS or DNS), also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. It is ... Down Syndrome Topic Overview WebMD Down syndrome is a lifelong condition in which a person is born with distinct physical features and some degree of cognitive disability. National Down Syndrome Society Official Site The leading human rights organization for all individuals with Down syndrome. What is Down Syndrome? National Down Syndrome Society For centuries, people with Down syndrome have been alluded to in art, literature and science. It wasnt until the late nineteenth century, however, that John ... Down syndrome Genetics Home Reference Down syndrome is a chromosomal condition that is associated with intellectual disability, a characteristic facial appearance, and weak muscle tone (hypotonia) in infancy. Read/download Down Syndrome: The Facts (The Facts Series) ebook full free online.