Delayed closure of fontanelles

Common: Cleidocranial dysostosis; Cranium bifidum with lacunar skull; Hypothyroidism; Infantile hypothyroidism; Intrauterine growth retardation; Osteogenesis imperfecta; Premature birth; Prenatal infection; Severe rickets; Trisomy 21
Uncommon: Aase syndrome; Aminopterin fetopathy; Aplasia cutis congenita; Chondrodysplasia punctata; Coffin-Lowry syndrome; Cutis laxa type 2; Familial idiopathic osteoarthropathy; Fetal hydantoin syndrome; Fetal primidone syndrome; Frontonasal dysplasia; GAPO syndrome; Greig cephalopolysyndactyly syndrome; Hallermann-Streiff syndrome; Hypochondroplasia; Hypophosphatasia; Infantile multisystem inflammatory disease; Kenny-Caffey syndrome; Lenz-Majewski dysplasia; Melnick-Needles osteodysplasty; Microcephalic osteodysplastic dysplasia; Occipital horn syndrome; Oculo-auriculo-vertebral spectrum; Opitz BBBG syndrome; Opsismodysplasia; Otopalatodigital syndrome type 2; Progeria; Pyknodysostosis; Rubinstein-Taybi syndrome; Schinzel-Giedion syndrome; Silver-Russell syndrome; Trisomy 13; Trisomy 18; Winchester syndrome; Yunis-Varon syndrome; Zellweger syndrome