Abstract: A teat (10) for an infant feeding bottle (1), including a resilient wall (12) defining a central nipple (14a) and an areola (14b) that extend around a central axis (L), said teat being elastically transformable between a distended state in which the nipple defines a global maximum (38) and at least one depressed state that is accessible from the distended state by forcing the nipple at least partially into the areola along the central axis, and in which said wall (12) additionally defines an annular double fold (32) that defines an outer local maximum (34) and an inner local minimum (36), both extending circumferentially around the global maximum, wherein the wall defines a circumferential fold region (30) that, in said at least one depressed state, ranges from the local maximum to the local minimum of the double fold, and wherein said fold region has a rotationally asymmetric stiffness distribution.

Abstract: To provide an infant drinking device with a more reliable aerator, the infant drinking device comprises a teat, a reservoir for holding a liquid, a connector for detachably connecting the reservoir to the teat, and an aerator. The aerator (e.g., a duckbill valve) includes a deformable opening (e.g., a slit) whereby internal/external pressure differential during use of the device is reduced in an open position of the opening by allowing air to enter through the opening into the reservoir and such that leakage of fluid from an inside of the drinking device to an outside of the drinking device is hindered in a closed position of the opening. During assembly of the teat, connector and reservoir, a minimally defined deformation of the opening of the aerator is enforced by at least one of a geometrical property and a material property of the teat or the connector.

Abstract: A teat (10) for an infant feeding bottle (1), including a resilient wall (12) defining a central nipple (14a) and an areola (14b) that extend around a central axis (L), said teat being elastically transformable between a distended state in which the nipple defines a global maximum (38) and at least one depressed state that is accessible from the distended state by forcing the nipple at least partially into the areola along the central axis, and in which said wall (12) additionally defines an annular double fold (32) that defines an outer local maximum (34) and an inner local minimum (36), both extending circumferentially around the global maximum, wherein the wall defines a circumferential fold region (30) that, in said at least one depressed state, ranges from the local maximum to the local minimum of the double fold, and wherein said fold region has a rotationally asymmetric stiffness distribution.

Abstract: To provide a drinking device with a more reliable aerator the invention relates to an infant drinking device (1), comprising a teat (10),a reservoir(60) for holding a liquid, the reservoir (60) being detachably connected to the teat (10) by a connector (50) of the infant drinking device (1), and an aerator (31), such as a duckbill valve, the aerator thereto comprising a deformable opening, for example a slit, such that an internal/external pressure differential during use of the device (1) is reduced in an open position of the opening (35)by allowing air to enter through the opening (35) into the reservoir (60) and such that leakage of fluid from an inside of the drinking device (1) to an outside of the drinking device (1) is hindered in a closed position of the opening (35), wherein the aerator (31) is included in the connector (50) or the teat (10), wherein during assembly of the teat (10), connector (50) and reservoir (60), a minimally defined deformation of the opening (35) of the aerator (31) is enforced