Abstract: A baby bottle with an air valve device has a bottle, an air valve device and a cap. The bottle has a mouth. The air valve device is a check valve and has a valve seat mounted on the mouth of the bottle and having at least one through hole, a valve stem and a valve disk. The valve seat has at least one through hole. The valve stem is mounted slidably through the valve seat and has a bottom end. The valve disk is attached to the bottom end of the valve stem and has an air chamber and an annular disk. The air chamber is hollow and has a proximal end attached to the bottom end of the valve stem. The annular disk is formed around and protrudes out from the proximal end of the air chamber and selectively closes the through hole in the valve seat.

Abstract: A baby bottle with an air valve device has a bottle, an air valve device and a cap. The bottle has a mouth. The air valve device is a check valve and has a valve seat mounted on the mouth of the bottle and having at least one through hole, a valve stem and a valve disk. The valve seat has at least one through hole. The valve stem is mounted slidably through the valve seat and has a bottom end. The valve disk is attached to the bottom end of the valve stem and has an air chamber and an annular disk. The air chamber is hollow and has a proximal end attached to the bottom end of the valve stem. The annular disk is formed around and protrudes out from the proximal end of the air chamber and selectively closes the through hole in the valve seat.

Abstract: A feeding bottle assembly mainly has an external bottle, an internal bottle and a cap. Either the external bottle or the internal bottle is able to conjugate with the cap to form a single bottle configuration so as to provide different capacities. The internal bottle is able to selectively be placed within the external bottle and the cap simultaneously encloses the external and the internal bottles to assemble as a dual-bottle configuration.

Abstract: An adjustable handle of feeding bottle for infants and children comprises two grips each having at least one first collar integrally formed thereon, said grips being slidingly disposed between an attachment, e.g. a cover or a securing ring, and a body of the feeding bottle, wherein said grips each further comprise a second collar formed thereon and a kink sized and spaced to receive a peripheral wall of an opposite second collar. In another embodiment, an adjustable handle of feeding bottle for infants and children comprises a first handle having an inner-collar integrally formed thereon, said collar having a circumferential track defined in an outside wall thereof, and a second handle having an outer-collar integrally formed thereon, said outer-collar slidingly received in said circumferential track of said inner-collar, whereby, said first and second handles are disposed between an attachment and a body of the feeding bottle.