Neanderthal gene in women boosts infertility

It is still unclear why some women go into labor for long periods, and some face a high risk of childbirth. Also, some women fall pregnant quickly, while others may take years before they conceive. The answer may be due to a gene inherited from the Neanderthals, an extinct species or subspecies of archaic humans who lived in Eurasia until about 40,000 years ago.