Abstract: A baby nursing bottle for being used in conjunction with collapsible liquid containers such as small disposable plastic bags. The baby nursing bottle comprises a cylindrical main body portion and a pair of longitudinal slots in the main body portion. The slots extend substantially along the length of the main body portion. A longitudinally movable plunger member is positioned within the main body portion, and a pair of tab handles are connected to the plunger and extend outwardly from the slots adjacent the outer surface of the main body portion for moving the plunger longitudinally within the main body portion when the tab handles are engaged and moved along the surface of the main body portion.