Proportion Footnotes off the top of my head

Proportions.

Head as a unit of measurement.
71/2 Usual- adult Midline crotch, one head to nipples- another to belly button, another below crotch.
2yr old 4.5 heads high,

8yrs 6.5 heads 

at 10 brow ridges undeveloped,angle of jaw sharper., 

14 about 7 heads.

Young kids more squarish forehead, at birth jaw more horizontal, lips compressed lower corners, big cheeks.
8 1/2  Heads highSlender and Fashiony-
9 more heroic and epic sculptural- even up to 12 (Michaelangelo).

Within that is the length of the spine and length of arms/legs.

Africans tend to have longer arms and legs versus the length of their spin- whereas Japanese say tend to have a longer back.