Abstract: The invention is disclosed as a nipple having a detachable coupler. In a first exemplary form the coupler the coupler is made to receive the nipple and to make a seal at the portion of the nipple abutting the coupler. The seal is made to prevent loss of fluid at the juncture or interface where the nipple meets the coupler. In the first exemplary form, the coupler has threads, which permit the coupler to be screwed onto a bottle having threads around the opening of the bottle. Fluid passes from the bottle into the coupler, through the coupler into the nipple and from the interior of the nipple into the baby's mouth. In a second exemplary form of the coupler, the coupler has an elastic opening to permit the coupler to be stretched over the opening of a fluid container. In the exemplary embodiments the interior of the nipple has a valve, through which all fluid must pass before exiting the nipple and entering the baby's mouth. The valve is made to limit the flow of fluids from the fluid container.