Table 1.

Growth is a change in proportion

Developmental stage	Body segment
	Head	Trunk	Lower extremities
Fœtus (early pregnancy)	50	34	18
Fœtus (mid to late pregnancy)	35	40	25
Newborn	25	40	35
Infant	23	37	40
Child	20	35	45
Pre-adolescent	18	34	48
Adult (skeletal maturity)	13	40	47

The ratio between lower limb and sitting height varies with age. Values are expressed in percentages (%) [1, 3–6]