Normal symmetrical skull development.
Normally, the child’s skull should be symmetrical, with a line drawn from the back of the ears and one from the tip of the nose, intersecting at right angles at the vertex of the skull.
When a child spends the majority of its time lying on only one side of the skull, the pressure may lead to deformation of the soft skull, because during the first months of life, the skull is very malleable.
Deformational plagiocephaly or “flat head syndrome”.