Boys’ Testosterone Levels Before Birth Seen in Fingers and Jawline

Image credit Sonja Windhager, Katrin Schaefer

You’ve probably heard about the correlation in men and boys between testosterone exposure before birth and the relative length between their index and ring finger. Basically, if your index finger is shorter than your ring finger, it means you were exposed to more testosterone in the womb, and if your index finger is longer than your ring finger, than it means you were exposed to less.

Researchers have recently discovered that testosterone exposure in the womb also affects the facial features of boys. Boys with high exposure to prenatal testosterone typically have “manlier” faces consisting of a more prominent jaw line and smaller eyes; boys with lower exposure to prenatal testosterone will have smaller chins and larger foreheads, giving them what researchers call a more “childlike and feminine face.”

Just an interesting fyi.

Read the whole story at Live Science.

{ 6 comments… read them below or add one }

Mike February 17, 2012 at 2:06 pm

My pointy chin, widow’s peak, and excess of body hair corroborate these findings.

Rob February 17, 2012 at 11:39 pm

Sorry Mike. High testosterone levels are associated with baldness, and those “men” with lots of hair, bodily or otherwise, well, you get the drift. (Look it up if you don’t believe me). Have a manly day-

Cathy Koentges February 18, 2012 at 1:39 am

Am I not understanding or did you get the rating reversed on the computer images. The little boy with the feminine chin and face says “high” and the kid with the strong jaw says “low.”

Jeremy February 19, 2012 at 1:43 am

‘High’ and ‘low’ both refer to 2nd to 4th digit ratio, not testosterone.

coamf February 21, 2012 at 3:34 pm

“(Look it up if you don’t believe me)”

I did and maybe you should too

Conquerer March 3, 2012 at 7:42 am

What happens if your ring finger and index finger are the same size? haha then you had just the right amount? Haha

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