Why do pregnant women to maintain physical balance?

From the physics point of view of pregnant women to maintain the body balance is a difficult task. But we all know that pregnant women be able to easily maintain a good balance, because the spine of men and women is very different, then there is what kind of difference?
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Pregnant women will not fall out of balance, because they are different from men's backs - a different, almost dating back to ancient times, our ancestors had just time to walk upright. This difference between female and male spine would help pregnant women in the body slightly thrown back, so she was not to increase due to the weight of the fetus lead to physical loss of balance. Two-legged animal problems is one of the front of the fetus in the mother's physical development, which forced the pregnant woman's body to the hip joint center of gravity tilt, can easily lead to physical imbalance.

On the contrary, four-legged animals, no such trouble, because their "pregnant", the body center of gravity is between the forelimbs and hind limbs, throughout the pregnancy period, there will not be the danger of imbalance in the body.

"When a pregnant chimpanzee trying to stand, she will face the same problems." Biological anthropologist at Harvard University, said Catherine.

Catherine and her colleagues studied 19 pregnant women to observe their walking performance.

Catherine, who found that as the fetal development, pregnant women, the physical nature of the growing imbalance, and their spine also will keep their heads off as a way to maintain body balance. Detailed anatomical measurements showed that part of the lower spine of women more than men close to wedge-shaped, which makes such a bend during pregnancy easier.

Catherine also found a link between women's vertebrae joints, but also large than men. This provides additional support provided vertebrae to prevent them lean back, the spine caused by a sudden pressure on bending caused scoliosis.