Seems like it's a different problem every day. This is where we're at right now:
--the LC at the hospital checked him for tongue tie and said he was fine.
--He was weighed while we were at the hospital, but we went home yesterday and he hasn't been weighed since. He was born 12/06 at 12pm @ 6lbs 15.5oz, his last weight was just prior to discharge, 12/08 at 9:30am @6 lbs 9.2oz. His TCB on 12/07 was fine (he was a 7 and they said anything under 14 was ok) so they did not do a blood draw to test bilirubin.
--His pees and poops are inadequate. Yesterday we had one wet/messy diaper that WE confirmed... the hospital had charted two pees before we were discharged but he was only out of my room once and only for about half an hour (to get rechecked by the ped for a heart murmur). So I don't know that I believe he had two wet diapers the single time he was out of my sight =P and then we had one more wet/messy diaper very late that evening (so it would've been 9:30am and 11pm, yesterday). Today we've had one wet diaper so far, about 9:30am.
--He is attempting to nurse pretty often, but more for comfort than for food, from what I can tell. He is very, very gassy and it's bothering him a lot. We're doing the gas drops, and trying to burp (though frequently he doesn't) and do pedal-feet, but he gets pretty inconsolable about it - for about a minute, then he farts and is fine. He roots for the breast but when offered, sort of... mouths it more than nurses, y'know? And when he's not uncomfortable and we're just trying to bf, he can sometimes get a pretty decent little latch and 3-5 good pulls and then his eyes are drifting off closed and no amount of getting him naked, tickling his chin, or washing his face with a cool rag will convince him to wake up for more than a few half-hearted tries.
--I am still not letting down for the pump, at all. Maybe half a dozen drops on the left but the right refuses to give anything. I've tried hand-expressing first, pumping while he's nursing the other side, pumping between feedings... it's just not working. Hand-expression works, it just takes FOR.EV.ER. ;) I'm not engorged (I'm able to soften the breasts pretty well with a thorough hand expression) but they are definitely full and achy and it seems impossible just to keep up!
I know he is hungry, he will eat whatever I hand-feed him... we just nursed (which is to say, 3-5 good pulls followed by an aggregate 10 minutes of attempts over 20 mins or so) and then he ate 5mLs of EBM with gusto.
But that was the first EBM I'd given him since 8:30a (I've been taking the night shift, and DH takes over in the morning so I can get some solid sleep) and I'm not convinced he was getting much just from nursing when I woke up to feed him between then so I'm just not sure he's getting enough. I think I need a scale so I can weigh him obsessively to calm my fears. -.-
Feeding times so far today: 0130, 0300 (comfort then 2.3mL EBM), 0600, 0830 (comfort then 2mL EBM), 1230, 1330 (comfort, and I expressed but didn't feed EBM bc he was finally resting comfortably), 1430 (comfort then 5mL EBM).
Wow, wall of text. Sorry. It helps me to keep it written down so I don't have to remember it - I might print this out and take it to an LC on Monday. 
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