This fact has not been lost on advertisers. We all know how sex sells. It's important to appreciate these perceptual differences between men and women. In the transgender community, we've spent a lot of time studying the physical differences between men and women. Anyone who truly wants to understand what it means to be the other gender, must recognize these less tangible but important differences.
Female infants are more responsive to the sound of a human voice in distress.
Very young males are more responsive to objects, and females to faces. Of course, infants are also talked to differently, looked at diferently, touched differently, depending what their gender is. At two months, there may already be a fair amount of social conditioning already taken place. But studies have been done showing in utero development. We start in a slightly different place-we bring different genes to the table.