Weight = density X volume, so the density of the breastmilk ingested 
would impact the weight. You cannot know the volume of the milk 
ingested simply by knowing the weight of the milk ingested. Only water 
weighs 1 ounce per 1 ounce volume, b/c its density is 1.
I have read that high fat milk weighs more than skim milk (greater 
density), although I think Gonekke has stated that the fat weighs less, 
so on that point I am confused. Either way, there is much we cannot 
know by the solid weight gain of the baby. We cannot assume that a baby 
who gains one ounce in weight has consumed one ounce of milk, nor can 
you know the composition of that milk, nor can you know how much milk 
the baby consumed and of what composition at the last feeding, nor what 
the next feeding will look like. This is not to argue that no one can 
possibly use test weighing to the advantage of a dyad, only that we may 
be making some false assumptions in the weighing.
Jennifer Tow, IBCLC, CT, USA


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