At China's highest-altitude neonatal intensive care unit (NICU) in Nagqu, Xizang Autonomous Region, every breath is a victory.

Dolma Choekyi was born after just six months of pregnancy, weighing less than 1,000 grams, in a car on the way to a hospital in Lhasa, hours away from home. In the past, her chances of survival would have been slim.

Today, thanks to a "group-style" medical assistance program bringing experts from across China, premature babies like her can receive world-class care right on the plateau. From endotracheal intubation to bedside ultrasound, these life-saving advances have turned what was once impossible into reality.

This is the story of doctors rewriting medical history on the Roof of the World, one fragile life at a time.