A newborn babys head makes up more than one quarter of the babys total length. Ratios can vary they can be smaller than this like 065 which just means the shape is curvier.

Human Anatomy Fundamentals Advanced Body Proportions
What are normal body proportions. The head to body. While convenient these ratios may not reflect the physiognomic var. 170 pounds pant size. According to fitness and hollywood physique expert greg ogallagher the ideal proportions are. The upper segment from vertex to the pubic symphysis is equal to the lower segment from pubic symphysis to the heel. Phi the golden number 1618 is a proportion found in many areas of the natural world as well as in the structure of the human body.
That ideal body fat level increases to 23 to 33 percent for women aged 40 to 59 and to 24 to 35 percent for women between the ages of 60 and 79. Women between the ages of 18 and 39 should aim for a body fat percentage of 21 to 32 percent. A span is taken to be 9 inches and was previously considered as half a cubit. In measurement body proportions are often used to relate two or more measurements based on the body. This is expected because on average and over a large age range the human body has an arm span that is roughly equal to its height and a femur bone roughly a quarter of its height. Large to extra large dress size.
Many of the bones that form our skeleton are thought to have a proportional relationship of 11618. Averages for women in the united states. 636 inches or 5 feet 3 inches weight. While there is significant variation in anatomical proportions between people there are many references to body proportions that are intended to be canonical either in art measurement or medicine. If the ratio between these is even then this is considered hourglass the preferred shape for women. At birth a babys head is relatively large making up one quarter to one third of his or her total body length while an adults head makes up just one eighth.
08 is the ideal ratio between waist and hips and waist and bust. Normal human body proportions normally in adults the height of the person is equal to the length of arm span. A cubit for instance is supposed to be six palms. Waist 45 47 of height shoulders 1618x waist arms identical size of neck circumference chest 10 12 greater than waist. In infants the upper segment is greater than the lower segment and the height is greater than the arm span.