Answer:
One can breast feed after a previous history of breast augmentation (breast implant.) However, there has been studies showing that lactation insufficiency (difficulty breast feeding) may result after the placement of a breast implant. This is dependent on the type of incision your plastic surgeon uses.
You can further read about breast feeding after breast implants from this article:
Breast Feeding after Breast Implants.
http://woodlandsplasticsurgery.blogspot.com/2010/12/breast-feeding-after-breast-implants.html