Jay - Your twin mom is letting down on both sides if she's letting down on one. The difference is either in actual supply or in the ability of the flange to access the milk (which will ultimately affect supply). She could try the large glass flange. A mom who was donating pumped milk found she got twice as much from one side as from the other, yet her baby seemed to swallow equally on both sides. Sure enough, when she tried the large flange, it hurt on the higher volume side, but got more milk out on the lower volume side. Just different placement of sinuses, I suppose, and her baby didn't seem to notice the difference tho the pump did. And a voice of dissention about the wet-nursing: An experienced nursing mother has fine-tuning built into her hands and her posture - subtle shifts of breast and baby that enhance a latch and that can't be imparted verbally very well. She may also have slightly "easier" breasts than a given mother, that can act as a sort of bridge to the mother's own. I've had a few vicarious experiences with breastfeeding-impaired babies being wet-nursed. One was the poorly-nursing premie baby of a mom who just couldn't pump well, tho baby needed the extra. Mom was tense, baby was hungry. Her sister nursed the baby a few times over a day or two, gave it several good full bellies-full while mom caught up on some sleep, then mom and baby were off and running. She was *vastly relieved* to have her sister help out, and nursed into toddlerhood. One was a non-latcher. The mom had a friend try, and baby still refused to latch. Mom felt better, knowing it was nothing *she* was doing wrong, and baby began nursing at 5 or 6 weeks. Baby had been deeply suctioned at birth... One was a premie whose skills seemed to improve - and whose mother's outlook improved - when an experienced friend nursed the baby and told the mom her baby was sucking normally. The last was a baby who had latched at his mother's non-elastic, flat-nippled breasts until given a bottle at a couple days of age. We got him nursing again, but his clamping caused mom to take him off repeatedly, and he became an aggressive non-nurser. Weeks went by, with no progress (this was years ago; I hope I'd do a better job now). She finally asked a friend to try. The friend held him snuggly in a nursing position, standing up, and started to bounce. The higher and harder she bounced, the better he sucked, and he ended up nursing. Still wouldn't nurse from mom, though. They arranged to spend an afternoon together nursing each other's babies. (The older baby was a little puzzled by the new mother's relatively featureless anatomy, but finally sort of shrugged and started nursing.) At the end of the afternoon, the new mom reported an entirely different suck on her finger - much more of a drawing motion than before. But the emotional toll was too much and she opted ultimately to bottle-feed. I will always wonder what would have happened if the wet-nursing had started before the mom was so worn down emotionally. The lessons to me? 1) Each case is different. No hard and fast rules. 2) Nursing *can* be learned at a breast other than mom's, because the hands are skilled and because any breast is going to be more like mom's breast than a bottle, finger, or cup is. Diane Wiessinger, MS, IBCLC Ithaca, NY