From Wikipedia, the free encyclopedia. Being transgender is one way of being gender-expansive, but not all gender-expansive children are transgender. This article has multiple issues. The male reproductive system includes both external and internal organs. In male embryos at six to seven weeks' gestation, "the expression of a gene on the Y chromosome induces changes that result in the development of the testes". Testicles are oval-shaped gonads that produce sperm. This article may need to be rewritten to comply with Wikipedia's quality standards. According to the Merriam-Webster Dictionary, a boy is "a male child from birth to adulthood".
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