A baby does not gain for a reason. So in these cases it is best to figure out WHY baby is not gaining well so you know how best to proceed. So is it that: 1) baby does not nurse frequently enough 2) baby does not nurse effectively 3) baby nurses fine but mom has low milk production or 4) baby is getting enough but there is an underlying medical condition that is preventing baby from gaining. Or 5) some combination of these.
This is pretty good milk transfer, and it is good transfer because you would expect a baby to take about 2-3 ounces a time at the breast at most at that age. So this suggests baby can nurse fairly effectively but maybe not as quickly as would be expected at this age. The problem with before and after weight checks is that they only tell you what happened in that ONE nursing session, and since a baby would typically take in different amounts at different sessions, this is limited information. However, these do show baby can transfer milk. Also, it is unlikely a palate issue or other physical barrier to nursing effectively would get worse as time went on, so I would not worry overmuch that the second transfer was less than the first. Again this is hlepful but limited information.
I know you say that increasing nursing session frequency did not help, but I don't understand how that can be, since baby does seem to be able to transfer milk. Even if baby only gets 1-2 ounces per session, 5 more sessions a day would equal 5-10 more ounces a day into baby.
A newborn baby needs to nurse a MINIMUM of 10-12 times a day. A baby who is nursing every two to three hours is nursing, at best, the minimum amount typically needed, and some babies need to nurse more often than that to get enough.
High frequency feeding is needed and is very normal, but taking an hour or more to feed after the very earliest weeks is a red flag that baby is not nursing as effectively as they should.
What has your LC suggested for helping baby nurse more effectively or to shorten feeding times? Have you tried breast compressions? What about supplementing with a lactation aid (sns or similar?)
No need to slam water. Drink to thirst (a breastfeeding mom will be more thirsty than usual.) Overloading on water does not increase milk supply as was once thought. Ditto foods. Moms do not need to follow a special diet to make milk. Eat what you want, you can add things like oatmeal that have reported milk making properties.
Pump output tells you very little about overall milk production. It makes sense that when you started nursing less you started pumping more milk, put that does not really help anything if the overall production stays the same.
How often is baby nursing overnight? While it is OK to take a longer break (up to 4 or 5 hours) in order to sleep, otherwise, a baby should still be nursing frequently overnight. Usually the early am is the best time for good supply, so it may make sense to nurse then, rather than giving a bottle?
What is a 'full" bottle? If baby is taking 4 or more ounces from a bottle, that is a ton and baby is not going to want to nurse for a while after such a big bottle.
Talk to your IBCLC about this, but I think it is important that baby nurses as much as possible, and right now I think that your concern about having time to pump and the output when pumping, plus the large amounts you are supplementing at a time is interfering with this.
So I would suggest-feed more. Feed your baby a
minimum of 12 times a day. Do not wait for cues, do not worry how long it has been since the last feeding, offer as much as you like. Nurse more, nurse every feeding, and pump after nursing for 10 or 15 minutes or so, to make sure the breast is well stimulated and "emptied" since baby is apparently not nursing very effectively. (Please note quotes, breasts are never really empty)
Supplement by giving SMALL amount-1 or 2 ounces, at the start of each feeding, and then nurse as long as baby wants or as long as you can keep baby actively sucking and swallowing. and/or, supplement while you nurse using a lactation aid.
What I fear is happening now is you are limiting time at the breast in order to pump more at each pumping session. This is understandable, I get it, but this is generally not the best way to build supply nor to teach baby to nurse better.
If it is too much for you to supplement, nurse and pump at every session, just do what you can, everything can be adjusted as you need-you do not have to do the same thing every time. But remember baby needs time at the breast to learn to nurse, your breasts need lots of stimulation and to have milk extracted as frequently as possible. Frequent extraction of milk is how to build milk supply, much more important than diet or even galactagogues. So upping time at the breast and frequency of milk extraction should help.
More info
http://kellymom.com/bf/got-milk/supp...es/low-supply/ I also suggest the book Making More Milk.