How can I best help my wife breastfeed? She has some problems with one breast and loses confidence when she tries to feed with that breast. However I know it's important she uses both breasts to prevent swelling or mastitis.

I agree with the mommy above, use the pump on the breast that she is having problems with and continue nursing with the other breast. My best friend experienced the same thing and this method seems to be the best way for her. Don't lose confidence over this, it might affect her overall breastfeeding experience, which is otherwise beautiful. Hang in there!