I did a little research for u- I got this off ivillage.Com
"breast implants, whether silicone or saline, may have other effects in pregnancy. Some women have increased breast tenderness as their own breast tissue grows, and that growth combined with the increased size present from the implants stretches the overlying skin to an uncomfortable degree. Depending on the technique used to place the implant, it may not be possible to breastfeed due to damage to the nerves and ducts under the nipple; most of the time, however, a woman with implants will be able to nurse. But certainly pregnancy is not the time to get implants for the first time!"
this was from another site
"11—
effects on pregnancy, lactation, and children
it has been suggested that children born to, and breast-fed by, mothers with silicone breast implants might be adversely affected by transmammary or transplacental delivery of silicone during either breast feeding or pregnancy. Silicone might be available for transmission since periprosthetic breast tissue, regional lymph nodes, and possibly more distant sites in such women are exposed to silicone fluid by gel fluid diffusion, to silicone gel in cases of implant rupture, and to silicone elastomer from implant shells. Mothers with breast implants might also have problems with breast feeding due to the effects of implant surgery, the implant itself, or fear of lactation insufficiency and transmission of complications to their infants. The committee has reviewed the effects of breast implants, especially silicone gel breast implants, during pregnancy and lactation.
Effects of silicone breast implants during pregnancy
the ability of silicone to pass the placental barrier depends on factors such as the size of the silicone molecule. The concentration gradient of silicone in the maternal and fetal circulation is also important. This gradient in turn is dependent on other factors, including the amount of silicone in the maternal-fetal circulation, the protein-binding ability of silicone, and the uterine blood flow. Whether silicone crosses the placenta has not been evaluated in women, but there is little evidence of any elevation of"
do a search for implants-pregnancy on the web--good luck!