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www.aafp.org/afp/2003/0615/p2547.html

Fontanel closure that occurs as early as three months of age can be within normal limits, but careful monitoring of head circumference in such cases is essential to exclude a pathologic condition.

medlineplus.gov/ency/article/001590.htm

The borders at which these plates intersect are called sutures or suture lines. The sutures allow for growth of the skull. They normally close ("fuse") by the time the child is 2 or 3 years old. Early closing of a suture causes the baby to have an abnormally shaped head. This may limit brain growth.

en.wikipedia.org/wiki/Fontanelle

The sphenoidal and posterior fontanelles close during the first few months of life. The closures eventually form the sutures of the neurocranium. Other than the anterior and posterior fontanelles, the mastoid fontanelle and the sphenoidal fontanelle are also significant. Closure. In humans, the sequence of fontanelle closure is as follows:

www.healthtap.com/topics/early-closure-of-anterior-fontanel

Doctors give trusted, helpful answers on causes, diagnosis, symptoms, treatment, and more: Dr. Fricke on early closure of anterior fontanel: Most kids will have what feels to be closure of the anterior fontanel by 15-18 mo but some may persist. The separation between the bones will persist to some degree until about 9 when kids reach their adult head size.

carta.anthropogeny.org/moca/topics/age-fontanelles-cranial...

Age of Fontanelles / Cranial Sutures Closure. Certainty Style Key. ... One pathological condition of particular interest in terms of fontanelle closure and brain development is craniosynostosis. Craniosynostosis is a condition in which the sutures and fontanelles prematurely fuse and result in a change in the growth pattern of the skull ...

www.babycenter.com/400_what-does-it-mean-if-my-babys...

hi to all, my baby is now 5.5 months and the pedi said that the anterior fontanelle seems closed earlier i.e. premature closure and better to do x-ray, i was shocked by this but thanks God when we did teh X-ray everything is normal the Dr. said that from the outside the skull appeared as closed but with the x-ray the fontanelle from inside is not closed yet and this is very good for the brain ...

www.paediatricpearls.co.uk/fontanelles-and-head-circumference-at...

2) PREMATURE FUSION OF FONTANELLES AND CRANIOSYNOSTOSIS. Closure of anterior fontanelle by six weeks always pathological (NB by 3 months 1% of normal infants will have a closed anterior fontanelle). Must always assess in conjunction with head circumference – early fusion associated with microcephaly (and less commonly, macrocephaly).

www.mayoclinic.org/diseases-conditions/craniosynostosis/...

The metopic suture runs from the top of the bridge of the nose up through the midline of the forehead to the anterior fontanel or soft spot and the sagittal suture. Premature fusion gives the forehead a triangular appearance and widens the back part of the head. This is also called trigonocephaly. Lambdoid.

emedicine.medscape.com/article/1175957-overview

Craniosynostosis consists of premature fusion of 1 or more cranial sutures, often resulting in an abnormal head shape. It may result from a primary defect of ossification (primary craniosynostosis) or, more commonly, from a failure of brain growth (secondary craniosynostosis).

craniofacial.vcu.edu/conditions/craniosynostosis.html

HOW DO YOU DIAGNOSIS CRANIOSYNOSTOSIS? If a family or pediatrician notices an unusual head shape, the infant should be referred for evaluation by a craniofacial specialist. Sometimes children are referred based on an unexpected change in head size (circumference) or early closure of the soft spot (fontanel).