What bony feature is typically only found in babies?

The bony feature typically only found in babies is the fontanelle, commonly known as the "soft spot" on a baby's head. These are gaps between the bones of the skull that allow for flexibility during childbirth and accommodate rapid brain growth in infancy. As a child grows, these fontanelles gradually close as the cranial bones fuse together. The most prominent fontanelles are the anterior and posterior fontanelles, which usually close by the age of 18 months.