By what age is the suture of the anterior fontanelle typically closed?

• A. 12 months
• B. 18 months
• C. 24 months
• D. 6 months

Answer: (B)

The suture of the anterior fontanelle typically closes around 18 months of age. The anterior fontanelle, often referred to as the "soft spot" on a baby’s head, is the membrane-filled space between the bones of the skull that allows for growth of the skull as the brain develops. This fontanelle is crucial during infancy because it accommodates rapid brain growth in the early years.

By the time a child reaches the age of 18 months, significant growth and development have occurred, and the bones of the skull begin to fuse at the suture. This closure is an important developmental milestone, as it is mostly complete by this age, allowing the skull to protect the brain effectively as it continues to grow and strengthen. Understanding the timing of fontanelle closure is essential for monitoring normal infant development and identifying potential issues related to cranial growth and brain development.