A breast implant having a fluid holding and flexible membrane body. A plurality of tabs are located along a perimeter extending side or underside of the body and are adapted for engaging a muscle layer upon which the body is supported. Inner defining partitioning walls establishing a plurality of chambers and include vents at inner locations in order to manage the transfer of fluid between the chambers. A corresponding nipple implant body also includes a reservoir chamber and an interconnected nipple extender chamber via a stop or check valve positioned therebetween, with the outermost nipple extender chamber being repositionable along a surface of the implant body.