Abstract: A device is disclosed for providing a suckling infant with a liquid diet supplement simultaneously with normal breast feeding. Improvement in suckling in the child and stimulation of the mother's milk supply are thereby encouraged. The device includes a container for holding the supplement and at least one tube communication with the supplement having an end which is positioned adjacent the user's breast nipple. A valve mechanism seats on the container mouth, and is comprised of a valve mount on which a flexible valve member is received. A portion of the valve member covers an aperture formed in the valve mount. The valve member prevents liquid from escaping through the aperture, but allows air to enter the container through the aperture when liquid is removed by suckling. The valve mechanism also permits ready and thorough cleaning of the thin tubing used.