Five weeks later:
Sam is up to 17 lbs now. We noticed some "rib retraction" the other day when changing a diaper. As he was breathing, his sternum was sinking into his chest noticeably as were his ribs. A check up with the pediatrician yesterday indicated that this is probably a case of his body growing faster than his ability to remove fluid. We're still ramping down on his Lasix (now 0.6 ml 1x/day). The effect is worse in the morning before he gets his Lasix. After that, his breathing and chest look normal. His body should get this straightened out when it has to stabilize after we stop giving him a small daily dose of diuretic. The trick is getting close to a zero dose so the "hand off" from external influence to his body having 100% control is as smooth as possible. I'll post a recent picture later today (tonight) hopefully.