syndrome is grouped as a pervasive developmental disorder (PDD) in which conditions are severe and pervasive, and that begin in early life and influence multiple areas of development. Rett syndrome, including the age of onset and the severity of symptoms, varies from child to child. Before the symptoms begin, however, the child generally appears to grow and develop normally, although there are often subtle abnormalities even in early infancy, such as loss of muscle tone (hypotonia), difficulty feeding…
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