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.