Abnormal fontanelle morphology Supernumerary fontanelle 2013-10-13T12:27:03Z Extra fontanelle An extra soft spot (fontanelle) on an infant's skull beyond the standard six normal fontanelles. HP:0012367 Fontanelles, often referred to as "soft spots," are one of the most prominent anatomical features of the newborn's skull. Six fontanelles are present during infancy, with the most notable being the anterior and posterior fontanelles. The typical fontanelles are the anterior, posterior, mastoid, sphenoid, and third fontanelles. Extra fontanelles include glabellar, metopic, sagittal (parietal) and cerebellar fontanelles.