Dear alps Lover,
I would hazard a guess at 5.4 lbs each, or about 2.5KG each. I think you were really close, but my own experiences with breast sixze and age bring me to believe that she is young enough to still have a lot of breast tissue and blood vessels in those breasts - not yet replced by fatty tissues - and as a reult, the expanse of liquid indicates that we should use plasma weight x estimated volume to get actual weight.
Since she is a double j which is close to about 3 litres capacity, and plasma weighs 1.8 lbs per liter, that would be 5.4 lbs per breast.
Opinions may vary, but there's mine.
Kindest regards,
Bone...