Considering Evolution And C-Sections

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This being the occasion of Charles Darwin's 202nd birthday, it seems as good a time as any to consider the evolutionary role of cesarean sections.

... the increasing numbers of C-sections have played a part in natural selection, particularly in mothers' pelvic size and babies' birth weight.

Not only does it account in part for babies' higher birth weight ... but it possibly could lead to larger brains and higher IQ ...

... the first cesarean sections ... were performed around 150 years ago ...

Over time, medical advances made the operations safer and more common. In the developed world, mortality rates during childbirth have decreased dramatically because of C-sections ...

The C-section liberated humans from the natural selection against mothers with smaller pelvises carrying larger fetuses. Because both mothers and their children survive delivery, they pass down their traits to next generations. As a result, birth weight has increased ... birth weights between 1960 and 1997 have increased 1 to 2 percent.

... "The maternal pelvis can get smaller over time and fetal birth weight can get greater over time, because there is now nothing to limit these changes," ...

Melissa Maimann, Essential Birth Consulting 0400 418 448