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The spot described is the anterior fontanelle. It sits in the midline where the sagittal and coronal sutures meet, with the frontal bones still unfused along the metopic suture. It’s the largest fontanelle and remains open for growth in infancy, typically closing around 18–24 months. The other options correspond to different suture intersections: the posterior fontanelle is where the sagittal and lambdoid sutures meet; the sphenoidal fontanelle is at the temple region near the sphenoid; the frontal fontanelle is not the intersection described.