Abstract: A compact, portable warmer which is insertable into a bottle for the purpose of warming and stirring contents of the bottle. The warmer has a projecting heating element having a stainless steel sheath configured similarly to a paddle, and a cap for protecting the heating element from contamination and for protecting external objects from heat from the heating element. The portable warmer includes a battery for powering the heating element, an on-off switch, and an electrical cable for recharging the battery from a socket of a cigarette lighter of a motor vehicle.