A teat, in particular for infants and small children, having a hollow nipple with at least one through-hole for liquid nutrition, which is connected at the bottom to a substantially annular-disc-shaped nipple flange, which serves to be fastened to the mouth of a vessel by means of a fastening ring with an annular-disc-shaped ring flange overlapping the nipple flange for pressing the bottom side of the nipple flange flat against the front-side edge of the mouth and at least one recess extending in the radial direction of the nipple flange on the top side of the nipple flange so that a ring flange of a fastening ring pressing against the top side of the nipple flange is spaced from the top side of the floor of the recess during the fastening of the teat on the mouth of a vessel, and the nipple flange is sufficiently flexible at least in the area of the recess so that the floor arches up and air from outside flows back into the vessel under the arched floor of the recess in the radial direction when the teat is fastened on the mouth of a vessel and negative pressure is created in the vessel when the nipple is sucked on.
