A teat unit for a feeding bottle (5) has a teat (1) and an adjusting mechanism (2, 3). The teat (1) can be altered in shape and/or degree of rigidity by means of this adjusting mechanism (2, 3). This makes it possible to use one and the same teat (1) in different forms. The teat can be adapted to the baby's requirements prior to, or during, sucking.