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This research study will learn more about the effects of testosterone shots on body fat and development in infants with XXY/Klinefelter syndrome.
This study is 6 months long and includes three in-person visits at the Children's Hospital Colorado. At the visits your baby will have a:
All infants in the study will receive testosterone shots.
47,XXY / Klinefelter syndrome
Less than 3 months of age
None. Some travel may be reimbursed.