has part has part characteristic of inheres in has modifier Large fontanelles UMLS:C0456132 There are six membrane-covered openings between the cranial sutures in the incompletely ossified skull of the fetus or newborn infant that normally close sometime after birth (anterior fontanel, cranial fontanel, mastoid fontanel, posterior fontanel, sphenoidal fontanel). In newborns, the two frontal bones, two parietal bones, and one occipital bone are joined by fibrous sutures, which form a small posterior fontanelle, and a larger, diamond-shaped anterior fontanelle. These regions allow for the skull to pass the birth canal and for later growth. The fontanelles gradually ossify, whereby the posterior fontanelle usually closes by eight weeks and the anterior fontanelle by the 9th to 16th month of age. Large fontanelles are diagnosed if the fontanelles are larger than age-dependent norms. UMLS:C4072822 HP:0000239 UMLS:C4072820 UMLS:C4072821 Wide bregma sutures SNOMEDCT_US:276709006 Enlarged fontanelles Large fontanels Large fontanel Large bregma sutures HP:0004473 Wide fontanelles Persistent wide fontanel Large fontanelle Large, late-closing fontanelle Abnormal fontanelle morphology abnormal increased size fontanelle