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Commonly misspelled Kleinfelter's Syndrome
Klinefelter's Syndrome, 47, XXY and XXY syndrome refer to a condition in which a male has an extra X chromosome. Normal male human DNA consists of 46 chromosomes (44 autosomal and 2 sex-linked chromosomes); in people with Klinefelter's Syndrome there is an extra X chromosome, bringing the count to 47. The most common symptom is infertility, though other symptoms such as sparse facial and body hair, small testes and gynecomastia may also manifest.
The syndrome was named after the phenotype was first described by Dr. Harry Klinefelter and his coworkers in 1942. Later studies have placed the incidence of Klinefelter's Syndrome in the general population at 1 in 500 to 1 in 1000 births, making it one of the most common genetic anomalies. 
We hope to soon have personal experiences of those with Klinefelter's Syndrome posted here.