Airless baby bottle

An airless baby bottle, which comprises:

• a) a baby bottle elongated shaft having at least one side wall, an open top and an open bottom and having a constant internal cross-section from a top view, said open top having attachment means for securing a nipple piece fastening collar thereto;
• b) a nipple piece fastening collar being removably attachable to said open top of said elongated shaft and having a central orifice for holding said nipple piece;
• c) a nipple piece having a main body with an outer rim and having a nipple with at least one liquid-release orifice, said nipple of said nipple piece having a plurality of accordion segments so as to create a rest position that is a short nipple position and so as to permit a stressed position that is an elongated nipple position, wherein, when a baby sucks on said nipple with suction force of at least one hundred mm Hg, said nipple will elongate from said first position to said second position and upon release of said suction, will recover from said second position back to said first position said nipple further having a top view footprint outer perimeter consistent with said elongated tube open top so as to nest thereon and under said nipple piece fastening collar, wherein when said nipple piece is situated on said elongated tube open top and said nipple piece fastening collar is placed over it and fastened to said attachment means of said elongated tube open top, a liquid impermeable seal is established;
• and,
• d) a piston having a feed orifice thereon and having a top view footprint outer perimeter consistent with said elongated shaft internal cross-section so as to sealably and moveably fit within said open bottom of said elongated shaft;
• e) a flexible feed tube connected to said piston feed orifice at one end and removably connected to said nipple at an opposite end;
• f) a bottom sealing cover for attachment to said open bottom of said shaft;
• wherein a user may fill the closed bottomed shaft with the desired level of liquid, insert the piston with the tube in the upright position to the top of the liquid to expel all air, connect the opposite end of the tube to the nipple, affix the nipple piece and the nipple piece fastening collar to the open top of the shaft to provide a feeding with a simulation of real woman breast-nipple experience to a baby, wherein the nipple is extended and the piston moves down toward the bottom as the baby sucks the liquid, and to further provide a feeding capability that does not require inversion of the bottle for feeding.