What is the definition of Bregma in a newborn?

Bregma refers specifically to the anatomical location on a newborn's skull where the two frontal bones and the two parietal bones meet. This point corresponds to the large anterior fontanelle, which is the soft spot on the top of a baby's head. The anterior fontanelle plays a crucial role during childbirth by allowing the skull to compress during delivery and subsequently expand as the brain grows. The presence of the anterior fontanelle is significant in the physical examination of infants, as it provides insight into brain development and cranial pressure.

In this context, while cranial fusion and measurements of head circumference are important concepts, they do not specifically define Bregma. Additionally, areas of brain development, although relevant to overall infant health, are not directly related to the anatomical structure represented by the term Bregma. Therefore, identifying Bregma with the large anterior fontanelle captures the essence of this critical point in a newborn's cranial anatomy.