Which syndrome is usually not diagnosed until puberty, when boys present with gynecomastia (breast development), small testes, shorter-than-average penises, low testosterone levels, tall stature, verbal cognition problems, and compromised fertility?

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Klinefelter's syndrome is characterized by the presence of an extra X chromosome in males (47,XXY), leading to symptoms such as gynecomastia, small testes, low testosterone levels, tall stature, verbal cognition issues, and reduced fertility, which are often not apparent until puberty.

Which Syndrome Is Usually Not Diagnosed Until Puberty, When Boys