• The average breast weighs about 400 grams. This can double during pregnancy.
  • The mean volume is about 560ml.
  • During menstruation, breast volume can vary as much as 13.6%, due to water retention and cell growth.
  • Breasts are almost never the same size, with the left breast usually larger than the right, with as much as 40 ml.
  • To breastfeed a baby, big breasts are not required - half an eggshell size would be enough to supply adequate nutrition