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October 21, 2005
Testosterone
Somebody grab the diapers!
The first surge of testosterone happens in the uterus, a few weeks into development, causing an embryo with the XY combination of chromosomes to develop male sex organs.
A second and poorly understood surge happens during infancy. About its only noticeable effect is when a baby boy's spontaneous erection shocks his parents.
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Posted on October 21, 2005 09:45 PM by Penis,12.
Filed in Penis Blog under penis, medicine & prostate cancer.
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