How are things going? Yes, some weight loss is NORMAL, up to 5-7% (Some sources say up to 10%) of birth weight. That is why the rule of thumb for a baby doing well is BACK to birth weight by 10-14 days. Was there ever another weight check done after the birth weight check? Baby may well have lost more than that but and is now in an upswing.
I am sorry but I am not getting something-does baby EVER latch and nurse-at all? Or is it all just pumping and cup feeding? (Brilliant you are cup feeding btw, Jack Newman has a nice video on that is you are still unsure about doing it. It does show the mom with her breasts exposed so, just fyi. http://www.nbci.ca/index.php?option=...id=6&Itemid=13
If you are went to a meeting or a 'class' led by an LC, that may be very helpful, of course, but that is not a La Leche League meeting, unless your local LLL Group does something a bit unusual, which is possible. But generally, LLL meetings are led by LLL Leaders, who are breastfeeding peer support volunteers. Some Leaders are LCs, just as some are nurses, doctors, or any other profession. But as Leaders, we offer mother to mother (or father) support, and usually I will let a dad attend a meeting if the other mothers there are in agreement and dad is willing to step out if neccesary. But that is my personal thing, not all Leaders would do that. Some Groups have couples meetings also.
I just think it would be helpful for your wife (or you) to talk to a Leader. You guys have alot going for you, your support of mom & baby is amazing. But you both need some reassurance and support.
If you want a book, I strongly suggest The Womanly Art of Breastfeeding (8th edition, 2010.) This edition is the first breastfeeding book to become a bestseller, and for good reason. This book is written for the new mom (or dad) & the info in there is all based on scientific evidence & very up to date-frankly much more up to date than much of the info even availble online. The book is at online sellers (Amazon etc.) brick and motar bookstores, Whole Foods & other health food stores around here carries it, your library may have it.