Harry Fitch Kleinfelter is a name that refers to a genetic disorder known as Klinefelter syndrome, which affects males and is characterized by the presence of extra X chromosomes. Some synonyms for Harry Fitch Kleinfelter include XXY syndrome, XXY trisomy, and 47,XXY. This condition is usually not diagnosed until puberty when the individual exhibits signs such as decreased muscle mass, infertility, and breast growth. While there is no cure for Klinefelter syndrome, there are treatments available to manage its symptoms, including testosterone therapy, speech therapy, and occupational therapy. With early diagnosis and proper treatment, individuals with this condition can lead fulfilling lives.