Может это промытая/отмытая/начищенная?  ну вы сами то плаценту сразу после родов видели? она ж толстая, нехило так наполненная кровью и частично с амниот.жидкостью - больше там, чем 500г. Выглядит как такой нехилый кусок печени.Иностранные источники о 0,7 говорят.    * At birth, a baby weighs about 3.3kg (7.3lb).    * The placenta, which keeps your baby nourished, weighs 0.7kg (1.5lb).    * The amniotic fluid, which supports and cushions your baby, weighs 0.8kg (1.8lb).The other two thirds of extra weight is due to the changes that happen to your body while you're pregnant. On average:    * The muscle layer of your uterus (womb) grows dramatically, and weighs an extra 0.9kg (2lb).    * Your blood volume increases, and weighs an extra 1.2kg (2.6lb).    * You have extra fluid in your body, weighing about 1.2kg (2.6lb).    * Your breasts weigh an extra 0.4kg (0.9lb).    * You store fat, about 4kg (8.8lb), to give you energy for breastfeeding (Murray and Hassall 2009: 214).