To provide a feed bottle economizing in use of a relatively expensive material from which a teat part is made.

The single-use feed bottle formed of plastics materials includes: a bottle body 2 for holding a quantity of milk or other liquid; a screw-threaded closure member 10 for sealing an opening 4 of the bottle body 2 in a fluid tight manner; a teat part 22 having a flange 24; and a retainer member 18 for clamping the flange of the teat part to the closure member. The closure member and the bottle body have a plurality of mutually cooperating formations 8 and 16 on the inner and outer surfaces respectively. The formations cause the closure to be irremovable from the body after the closure member has reached a limit position on the bottle body, in which it forms a fluid-tightly fit with the bottle body. The retainer member is adapted to have its periphery clamped between the closure member and the rim of the bottle body when the closure member is in an irremovable position. The teat part has a flange of smaller diameter than the inner diameter of the opening part of the bottle body. The retainer member has an integral central annular protruding disk protruding into the teat part.