Premature closure of fontanelles (HP_0005458, a Human Phenotype Ontology term) can be described as follows. Normally, the posterior and lateral fontanelles are obliterated by about six months after birth, the anterior fontanelle closes by about the middle of the second year. This term refers to the situation in which the fontanelles close at an inappropriately early time point. Also known as: Early closure of the fontanelles, Obliterated fontanelles, Premature fontanel closure.