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It’s not really surprising how pregnant women avoid tipping over: they lean back. What Shapiro and the other researchers learned was that evolution has made that (somewhat) easier for women. According to UT, the researchers studied 19 pregnant women, and they discovered that a woman’s lumbar, or lower back, curve extends across three vertebrae. In men, it extends across two. The joints between the vertebrae also are larger in females and angled differently from those of males to better support the extra weight. The researchers say the extra back support evolved about 2 million years ago, and likely came about as a direct result of walking upright.
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