An infant nasal interface prong device for use with a continuous positive airway pressure (CPAP) system, the device comprising: first and second nasal prongs (22,24); and a base connected to each of first and second nasal prongs (22, 24) by means of a first passage and a second passage respectively, each defining a passage axis, the first and second nasal prongs (22,24) each including: a bellows segment, a tip extending from the bellows segment, the tip adapted for insertion within an infant's naris and terminating in a tip end opposite the bellows segment, wherein the tip includes a tip body extending from the bellows segment to the tip end, and further wherein relative to an orientation upon insertion within an infant's naris, the tip body defines a top side and a bottom side, and further wherein at least a portion of the top side forms a convex curve and at least a portion of the bottom side forms a concave curve; a foot extending from the base to the bellows segment; and a lumen (28, 30) extending through the prong and open at the tip end, wherein in an undeflected state, a central axis (A bellows) of the lumen as defined by the bellows segment is transversely offset from a central axis (A tip) of the lumen as defined by the tip end, and, relative to the passage axis, a central axis (A foot) of the foot projects laterally outwardly with proximal extension of the foot from the base, the central axis (A Belllow) of the bellows segment projects laterally inwardly with proximal extension of the bellows segment from the foot; and the central axis (Atip) of the tip projects primarily longitudinally with proximal extension of the tip from the bellows segment; the base being adapted for coupling to a CPAP generator and forming first and second passages (72, 74) fluidly connected to respective ones of the first and second lumens (28, 30). first and second nasal prongs (22,24); and a base connected to each of first and second nasal prongs (22, 24) by means of a first passage and a second passage respectively, each defining a passage axis, the first and second nasal prongs (22,24) each including: a bellows segment, a tip extending from the bellows segment, the tip adapted for insertion within an infant's naris and terminating in a tip end opposite the bellows segment, wherein the tip includes a tip body extending from the bellows segment to the tip end, and further wherein relative to an orientation upon insertion within an infant's naris, the tip body defines a top side and a bottom side, and further wherein at least a portion of the top side forms a convex curve and at least a portion of the bottom side forms a concave curve; a foot extending from the base to the bellows segment; and a lumen (28, 30) extending through the prong and open at the tip end, wherein in an undeflected state, a central axis (A bellows) of the lumen as defined by the bellows segment is transversely offset from a central axis (A tip) of the lumen as defined by the tip end, and, relative to the passage axis, a central axis (A foot) of the foot projects laterally outwardly with proximal extension of the foot from the base, the central axis (A Belllow) of the bellows segment projects laterally inwardly with proximal extension of the bellows segment from the foot; and the central axis (Atip) of the tip projects primarily longitudinally with proximal extension of the tip from the bellows segment; the base being adapted for coupling to a CPAP generator and forming first and second passages (72, 74) fluidly connected to respective ones of the first and second lumens (28, 30).