Any abnormality of the fontanelles (the regions covered by a thick membrane that normally ossify in the first two years of life) or the cranial sutures (the fibrous joints in which the articulating bones or cartilages of the skull are connected by sutural ligaments). The phenotype is Abnormal cranial suture/fontanelle morphology (HP_0000235). Also known as: Abnormality of the fontanelles or cranial sutures.