When we place breast implants, the normal method is to place the implant behind the muscle. So what is done is that the breast and muscle are simply lifted forward and the implant slots in behind. So, in the event of a pregnancy or breast feeding the breast acts exactly as it would with or without an implant in place. And after the pregnancy and/or breast feeding, the breast tissue will change as it would with or without an implant.
The implants themselves are inert, man made devices, they do not change in response to the changes in the overlying breast when pregnancy occurs. So, they are unaffected.
What can change is the perkiness of the breasts. If the breasts get extremely large and the skin stretches it can lead to a drooping problem. But again, this is a breast problem, not an implant problem. Also, there is absolutely no evidence that having a breast implant in place, saline or silicone filled, affects the breast milk either.
Hope this helps to answer a fairly common question particularly among our younger implant patients.
Lee E Corbett, MD
Medical Director, Corbett Cosmetic Aesthetic Surgery and MedSpa