A teat for use with a fluid container comprises a deformable mouthpiece for an infant to suck on during a fluid intake action and an inner core (20) disposed within the mouthpiece. An exterior surface (21) of the inner core (20) is spaced from an interior surface of the mouthpiece at the position of a fluid pocket guiding face (22) of the exterior surface (21) of the inner core (20) so that a fluid duct between the mouthpiece and the inner core (20) is defined which allows the infant to perform a peristaltic fluid intake action. At least one of the interior surface of the mouthpiece and the exterior surface (21) of the inner core (20) has at least one protrusion (23) that is designed to form a fluid barrier between the mouthpiece and the inner core (20) at a position for delimiting the fluid duct at the sides thereof.
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