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What is Greatest amount of cranial growth occurs by: and explain in detail?
The head of a newborn is about 55%–60% of adult head breadth, 40%–50% of adult height and 30%–35% of adult depth. The cranium to-face ratio in a newborn is 8:1.  With continued development, especially of the lower face, the ratio changes to 1:2 in adulthood.
By the age of 8 years, the brain is nearly 95% of its adult size. This rapid growth spurt is followed by a plateau phase of slow but steady growth that continues till adulthood.