Fuente: WIPO "milk" Methods, devices, and systems for concentrating breast milk are described. Concentrating nutrients in breast milk may be achieved using an apparatus comprising at least one forward osmotic membrane. In an example the apparatus can include a first sheet of material comprising a forward osmotic membrane, a second sheet of material sealed to the first sheet of material about a common outer perimeter thereof, the first sheet of material arranged so that water can traverse the forward osmotic membrane to an interior of the first and second sheets, and a dry carbohydrate within the interior of the first and second sheets exhibiting an osmotic draw property to draw water from un-concentrated, expressed human milk to form concentrated human milk. After a predetermined time, or upon the milk remaining after drawing of water through the membrane being a desired amount, the water draw can end.