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 ________________________________________________________________________ Check out AOL.com today. Breaking news, video search, pictures, email and IM. All on demand. Always Free. *********************************************** To temporarily stop your subscription: set lactnet nomail To start it again: set lactnet mail (or digest) To unsubscribe: unsubscribe lactnet All commands go to [log in to unmask] The LACTNET mailing list is powered by L-Soft's renowned LISTSERV(R) list management software together with L-Soft's LSMTP(R) mailer for lightning fast mail delivery. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html