At birth, infants' heads are proportionally very large. Other parts of the body grow to even out the proportions, which is known as:

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Quizplus · Accepted Answer

Directionality refers to the pattern of growth that human bodies follow, where growth starts at the head and moves down towards the feet. This explains why infants' heads are proportionally larger at birth, with the rest of the body growing later to even out proportions.

At Birth, Infants' Heads Are Proportionally Very Large