What are the symptoms of fused skull bones?

None.: As a newborn, none of the skull bones are fused; there are membranes/cartilage that fill spaces between them. Gradually this converts to bone (ossification), mostly during childhood, but process may not be complete till age 25! if they fuse prematurely, will cause intracranial pressure, head pain, visual problems, and unusual head shapes causing low self-esteem. Craniosynostosis requires surgery.