body build and its inheritance heredity human anatomy 1 boys of ages ti to 7 2 boys of gt to 10 gt boys of 15 to hi of baltimore sehools whereas t lie distance from umbilicus to vertex increases only slightly in passing from the youngesl to t lie eldest group the distance of the umbilicus above the flour increases greatly the increase of stature is mainly increase in length of leg again boys of to 10 years have shoulders fund chests very little broader than those of 6 to 7 years but boys of 15 and 16 years i whose relative chest girth is much above the minimum of 12 rhhdjc.jpg from 155chan gr　boys View Photo