A breast pump system having a suction tubing, a milk tubing, a pump, a three way vent valve, a milk bottle, an isolation valve and a breast shield, wherein the first end of the suction tubing and the first end of the milk tubing are fluidly connected to the pump； wherein the second end of the suction tubing and the second end of the milk tubing are fluidly connected to the breast shield； wherein the three way vent valve is fluidly connected between the pump and the breast shield on the suction tubing； wherein the milk bottle is fluidly connected on the milk tubing between the breast shield and the pump； and wherein the isolation valve is connected on the milk tubing between the milk bottle and the pump.
