Abstract: The present invention relates to a system for use in delivering air into the interior of a baby bottle while the baby is feeding. Thus, the device of the present invention enables a smoother delivery of feeding fluids to the baby while avoiding unwanted vacuums within the interior of the baby bottle. In its broadest context, the present invention includes a baby bottle having a bottom end with an aperture formed therein. A threaded bottom cap is adapted to be threadably secured over the bottom portion of the bottle. This cap portion has an aperture which is adapted to be aligned with the aperture of the bottom of the baby bottle. A one-way valve is adapted to be removably positioned in between the aperture of the bottom of the baby bottle and the aperture of the bottom cap. Thus, the one-way valve ensures that air can be delivered to the bottom interior region of the baby bottle without any air escaping from the bottom interior region of the baby bottle.