This may be related to the type of implant. I've heard anecdotal evidence of these sounds with saline implants, although I've not personally experienced this with any patients before. The theory is that some air gets trapped in the implant during the filling of the saline, creating a space for the fluid slosh around in. During surgery, it's important for the surgeon to ensure all the air is removed BEFORE adding in saline. This is a fairly basic technique that is taught early in training to board certified plastic surgeons, but not everyone who performs this surgery has appropriate training. Visit with a surgeon boarded by the American Board of Plastic Surgery to discuss your options.