Fontanelles, which are the soft spots located on a baby's skull, have several synonyms. One of the most common is "cranial sutures," which refers to the joints between the bones of the skull. Another synonym is "fonticulus," which is Latin for "little fountain"' and describes the small, fluid-filled spaces of a baby's skull. Other synonyms for fontanelles include "skull sutures," "cranial spaces," and "fontal gaps." While all these terms refer to the same anatomical feature, they each provide a unique way of describing the soft spots on a baby's head. It's important to note that fontanelles are a natural and necessary feature of a baby's skull and typically close within a few years after birth.