Just some anecdotal info for the mother of twins having trouble breastfeeding
one of them.  I worked with such a mother a few years ago. I was her labor
nurse and she had a vaginal delivery for the first twin, but a c-section for
the other twin for genuine fetal distress. The first twin was significantly
larger than the second one (6# vs 4#) and the smaller one was slow to latch
on at first.  I was  a little concerned about this one when she went home and
was surprised when  she called me a week later and was pumping to feed the
larger twin who wasn't latching on very well. The mother nursed each twin on
one breast exclusively and the nipple that that baby nursed from was
significantly traumatized  when I saw her.  I quickly found a short frenulum
in the larger twin which her pediatrician promptly clipped.  That twin did
well thereafter.  I think it was good for this mother that one twin was
nursing well.  It helped her "stay with it" when otherwise  I think she might
have quit.  Also, the fact that each baby nursed on only one side made
finding the problem relatively easy.  As someone else mentioned,  this
mother's problem need not lead to permanent weaning.  If she continues
breastfeeding the one twin, perhaps, eventually she may be able to overcome
the problem with the other one and resume breastfeeding him or her.

Lacy 5 k @aol.com
Evansville, IN