Robin: It's been demonstrated that even insulin-requiring diabetics have lower insulin requirements while breastfeeding. I don't have the references, but Lawrence's text "Breastfeeding: A guide for the medical profession" 1994 CV Mosby, has an excellent review of the issue. There is no guarantee that this mother won't still need insulin, but if she does, it is best that she stay on insulin, which does not affect the baby at all, than switch to micronase (glyburide) or other sulfonylureas, whose effects on babies are less well known. In any case, whether or not she will eventually need insulin, she is probably less likely to if she breastfeeds. One of the important factors in adult onset diabetes control is staying at one's optimal weight, and breastfeeding mothers tend to lose more weight than bottle feeding moms. Hope this helps. Alicia. [log in to unmask]