Breast pump and breast pump valve assembly

A breast pump comprising:

• a suction chamber and a vacuum port for fluidly connecting the suction chamber to a negative pressure source;
• a breast receiving part, a fluid collection container, and a fluid flow path extending between the breast receiving part and the fluid collection container;
• a fluid chamber defined between a first one-way valve and a second one-way valve in the fluid flow path, wherein the first one-way valve is configured to allow flow of fluid from the breast receiving part into the fluid chamber, and the second one-way valve is configured to allow flow of fluid from the fluid chamber to the fluid collection container;
• and
• a displacement member fluidly separating the suction chamber and the fluid chamber, wherein the displacement member is configured such that application of negative pressure to the suction chamber causes movement of the displacement member to thereby increase the volume of the fluid chamber and draw fluid from the breast receiving part through the first one-way valve into the fluid chamber, wherein the displacement member and first and second one-way valves are integrally formed.