You know, there's nothing like an infant to make throw the differences between men and women into sharp relief. You know, I don't mean to sound divisive, but there are more differences between the genders than anatomy.
Case in point: Both of my daughters, as infants, explored like most babies do. However, there was a sense of caution to eveything they did. You could almost see the gears tick as they approached something, "Is this going to hurt me? Can I pull myself up on this?" And if they tried something, and it didn't work, they usually didn't try and do it again.
Flash forward to present day. My boy, God love him, approaches everything he does with reckless abandon. I understand that there are probably plenty of infant boys that don't have a daredevil spirit, but I do know that a boy will do the same thing, over and over and over and over, expecting to get different results than the first time.
It is with all this set up that I explain the main difference between my daughters and my son. At 8 months old, my boy has learned how to crawl down from things like ottomans and couches. My daughters never really wanted to do this, on purpose anway. The huge difference is that my boy, while slowing his descent by holding on to the edge of the ottoman or couch, breaks his fall with his head.