When a baby is born, the bones of the skull are meant to behave like the slats of a wooden barrel, flexible enough to slide into the correct orientation as the brain beneath them doubles in size during the first year of life. However, in about seven of every 100,000 births one of those seams between the bones of the skull (called a suture) closes too early along a single side of the forehead, a condition called unicoronal synostosis (or UCS). Instead of rounding out evenly, the skull twists: one brow pulls backward, the opposite brow juts forward, the eye sockets tilt, and the nose shifts off‑centre. Beyond cosmetic considerations such as the visible asymmetry, these children can also face raised brain pressure, vision problems and slower development.