[kqr]

But this specific thing we do have a strong indication of! But a few hours after birth, infant boys spend a longer time looking at mechanical objects than faces, and vice versa. This is thought to be before any social imprinting has had time to develop.

It's funny that you write this comment in this specific thread, because as far as I know, it's literally the only gender difference we've observed truly since birth. (Besides some physical ones like which reproductive organs are in place, obviously.)