The invention relates to a method for disinfecting a bottle (1), in particular a baby bottle, having a bottle jacket (2) that is open at both ends, wherein in a dispensing position, a bottom cap (8) is fastened to a bottom-end opening (4) and a nipple (9) is fastened to a nipple-end opening (3) by means of a fastening ring (7), and the inner circumference of the bottom-end opening (4) is greater than the outer circumference of the fastening ring (7), wherein in order to transition the bottle to a disinfection position, the bottom cap (8) is removed from the bottle jacket (2), the nipple (9) and the fastening ring (7) are placed onto the bottom cap (8) or inserted into the bottle jacket (2), the bottom cap (8) is attached to the bottom-end opening, and a disinfectant, in particular water (15), is poured into the bottle jacket (2) before the bottle (1) is heated in order to disinfect the bottle.
