Isn’t is a wonder…finally there is a reason why we can hold a massive bump of one, two, three, four and more multiples of children and still stay on our feet. And it’s not because of gravity alone, it seems…
Women do not tip over during pregnancy because their spines are built differently from men’s ? and have been ever since our ancestors began walking upright. The difference allows a pregnant woman to lean backward to counterbalance the weight of her developing fetus.
One problem with bipedalism is that the growing foetus sticks out to the front, shifting the mother’s centre of mass forward of her hip joint, creating a tendency to tip over.
