This sometimes results in teachers and other adults labeling them as troublemakers because they expect more maturity from bigger girls.However, they are usually as emotionally mature as other girls of their age.They have exceptionally small, widely spaced breasts, broad shield-shaped chests, and turned-out elbows.
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As adults, these "super-males" are usually tall (above 6 feet) and generally appear and act normal. During adolescence, they often are slender, have severe facial acne, and are poorly coordinated.
They are usually fertile and lead ordinary lives as adults.
Like Down syndrome and other autosomal problems, sex chromosome gross abnormalities can be diagnosed before birth by amniocentesis and chorionic villi sampling. Normal males inherit an X and a Y chromosome while females have two X's.
A single Y chromosome is sufficient to produce maleness while its absence is necessary for femaleness.
They are sterile or nearly so, and their testes and prostate gland are small.
As a result, they produce relatively small amounts of testosterone.The feminizing effects of this hormonal imbalance can be significantly diminished if Klinefelter syndrome boys are regularly given testosterone from the age of puberty on.Like (described above), many Klinefelter syndrome men are an inch or so above average height. They usually have learning difficulties as children, especially with language and short-term memory.If not given extra help in early childhood, this often leads to poor school grades and a subsequent low self esteem.However, most are sufficiently ordinary in appearance and mental ability to live in society without notice.Beginning around the normal age of puberty, estrogen replacement therapy can result in some breast development and menstruation.