The cerebellum develops in a rostro-caudal manner, with rostral regions in the midline giving rise to the vermis, and caudal regions developing into the cerebellar hemispheres.[2] By 4 months of prenatal development, the vermis becomes fully foliated, while development of the hemispheres lags by 30–60 days.[3] Postnatally, proliferation and organization of the cellular components of the cerebellum continues, with completion of the foliation pattern by 7 months of life[4] and final migration, proliferation, and arborization of cerebellar neurons by 20 months.[5]