First of all, some women that never had surgery can’t breast feed. While the implant, in most cases is separated from the breast by a layer of muscle, there will be some trauma to the tissue in the placement process.  This may  decrease the likelihood of successful breast feeding.  If the milk comes in successfully, many experts think that women with implants can breast-feed safely.

To look into this further, the FDA and La Leche would be good places to start. As with any product, there are those who profess to be experts and espouse less than scientific data. I dare say, you can't pick any topic of discussion today and find some "expert" who has a dissenting opinion and a litany of reasons to "prove" their point.

Should those with artificial silicone joints, silicone wrist bone replacements, a history of Norplant use (made from implanted silicone and hormones) vascular shunts (silicone tubes), hair spray and WD-40 users (we breathe in that silicone), silicone based makeup users and people who have chin implants, cheek implants or silicone sheeting for TMJ (Jaw)  and orbital (eye socket) problems  be discouraged from breast feeding?

They all have silicone in their bodies too!

Many experts believe that silicone has no effect on breast-feeding. No one, however, can give you an absolute guarantee. Therefore, the risk/benefit ratio is an individual decision that people have to research for themselves. You will find articles with dissenting conclusions. It has been my experience that most women with implants in my practice that are interested in breast feeding, do so successfully.