Taken from “Teachings in the Science of Osteopathy,” W.G.Sutherland, DO…. The articulation between the condyles of the occiput and the facets of the atlas is the one established joint at birth. Otherwise, there are no articualr sufaces because there are no joints with “gears” at birth. In fact, the different parts of the individual bones of the cranial base grow until the bones are ossified and their parts fused. As part of the growth process, the different bones meet, with the result that joints form gradually and articular surfaces begin to develop. The formation of articular gears for articular movement between the bones, at the sutures, of the human cranium becomes more established around the seventh to ninth years of life, or even later.