Childbirth is both joyful and painful for women. It is not uncommon for women to die because of it. Only humans experience such difficulty during childbirth. Why? It is because humans walk on two legs and our brains have evolved. The human pelvis became smaller to adapt to bipedal walking, and the baby 's skull became larger to accommodate brain groeth. As you can see, there is only a tiny gap between the baby's head and the birth canal. This is why women suffer during childbirth. Humans evolv
