Abstract: A nursing bottle assembly including a nipple member having at least two openings and an outer annulus and an inner annulus which both extend downwardly from an end at a widest of the openings of the nipple member. The assembly also includes a bottle member having at least one opening and an upper portion adjacent the opening of the bottle member. The upper portion includes an outer upwardly extending projection with external threads and an inner upwardly extending projection. The inner projection is spaced from the outer projection at a distance sufficient for receiving the outer annulus of the nipple member between the inner and the outer projections of the bottle member to substantially prevent sidewise movement of the widest opening end of the nipple member relative to the bottle member. In addition, the assembly includes a securing ring having an internally threaded portion which is engaged with the external threads of the bottle member outer projection.