<unk>  is a congenital (present at birth) defect that causes one or more sutures on a baby's head to close earlier than normal. Sutures are connections that separate each individual skull bones. The early closing of a suture leads to an abnormally shaped head.
Craniosynostosis
Melorheostosis
Achondroplasia
Craniometaphyseal dysplasia
Subdural hygroma
Otospondylomegaepiphyseal dysplasia
Acrodysostosis
Thanatophoric dysplasia