The case of the 7-month-old identical twin whose sex was accidentally altered by a physician provides evidence that gender is entirely a matter of nurture.

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The case often referred to involves David Reimer (initially raised as Brenda), and it suggests that gender identity is not solely a result of nurture. Despite being raised as a girl, David identified as male, indicating that factors beyond socialization contribute to gender identity.

The Case of the 7-Month-Old Identical Twin Whose Sex Was