A method for disinfecting a bottle, in particular a baby bottle, including a bottle jacket which is open on both ends, wherein, in a dispensing position, a bottom cap is fastened to a bottom-side opening and a teat is fastened to a teat-side opening by a fastening ring, the inner periphery of the bottom-side opening being larger than the outer periphery of the fastening ring, wherein, for transfer into a disinfection position, the bottom cap is removed from the bottle jacket, the teat and the fastening ring are placed onto the bottom cap and introduced into the bottle jacket, the bottom cap is attached to the bottom-side opening, a disinfectant is filled into the bottle jacket before the bottle is heated for disinfection.
