A method of feeding breast milk to an infant includes providing a spout pouch having a spout, providing a plurality of adapters configured to couple to the spout pouch, coupling the spout of the spout pouch to a first adapter, coupling the first adapter to a breast pump, operating the breast pump to express breast milk into the spout pouch, so that the spout pouch collects the expressed breast milk, coupling a second adapter to the spout of the spout pouch, and coupling the second adapter to a nipple, so that expressed breast milk flows from the spout pouch to the nipple. Other systems, methods, and components are also provided.