In her memorable novel Reindeer Moon, Elizabeth Marshall Thomas tells a harrowing tale of a winter birth in Ice Age Siberia. As Yanan, seven winters old, is traveling with her family between winter lodges, her mother goes into labor. While the family makes camp, Yanan's mother goes off alone to find a suitable birthing-place. (Since predators are drawn to the smell of blood, to give birth in camp would endanger everyone.)
She finds herself a spruce with a good, strong trunk to brace her back against, low protecting branches, and ample duff to absorb the birth fluids. She builds a fire for what warmth and protection it can offer, crouches against the bole of the tree—squatting is the natural birthing-position for humans, with Earth herself helping to pull the baby from the womb—and prepares herself for a long night.
Thomas knows whereof she speaks. As a young woman in the 1950s, her anthropologist parents took her and her siblings to the Kalahari Desert to live with the !Kung, among the very last of Earth's hunter-gatherers. Her personal experience and careful observation of Bushman culture lend her stories of the Eurasian Ice Age a noteworthy sense of authenticity.