Calculations for each Part of the Body

Below I've calculated the volume and total surface area for each part of the body. For the purposes of this investigation, I used measurements of myself for the dimensions of an adult and assumed that an infant is 1/5 of that size.

Main Body

Adult: h = 62 cm C = 84 cm C = 2πr r = C / 2π r = 13.3690 cm A = 2πr2 + 2πrh A = 6330.9888 cm2 V = πr2h V = 34812.8364 cm3

Infant: h = 62 / 5 = 12.4 cm r = 13.3690 / 5 = 2.6738 cm A = 2πr2 + 2πrh A = 253.2396 cm2 V = πr2h V = 278.5027 cm3

Legs

Adult: h = 86 cm C = 38 cm C = 2πr r = C / 2π r = 6.0479 cm A = 2πr2 + 2πrh A = 3497.8272 cm2 V = πr2h V = 9882.2885 cm3

Infant: h = 86 / 5 = 17.2 cm r = 6.0479 / 5 = 1.2096 cm A = 2πr2 + 2πrh A = 139.9156 cm2 V = πr2h V = 79.0609 cm3

Arms

Neck

Adult: h = 10 cm C = 35 cm C = 2πr r = C / 2π r = 5.5704 cm A = 2πr2 + 2πrh A = 544.9648 cm2 V = πr2h V = 974.8240 cm3

Infant: h = 10 / 5 = 2 cm r = 5.5704 / 5 = 1.1141 cm A = 2πr2 + 2πrh A = 21.7990 cm2 V = πr2h V = 7.7988 cm3

Head

Adult: C = 64 cm C = 2πr r = C / 2π r = 10.1859 cm A = 4πr2 A = 1303.7973 cm2 V = (4/3)πr3 V = 4426.7901 cm3

Infant: r = 10.1859 / 5 = 2.0372 cm A = 4πr2 A = 52.1519 cm2 V = (4/3)πr3 V = 35.4143 cm3