Any of several soft spots in specific locations on the skull of the newborn where the bones have not yet fused and the brain is covered by skin and a tough membrane.
See also: cranial suture
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 757 (https://doi.org/10.1515/pac-2015-1202)