Abstract: A new baby nurser with plunger device for evenly expelling excess air for a nurser-style bottle. The inventive device includes a plunger portion that includes a circular base. The plunger portion includes a post extending upwardly from the circular base. The post has a flat upper free end. The post is dimensioned for being received within an open lower end of a shell of a baby nurser. A rubber dome is positioned within the open lower end of the shell below a liner therein. The rubber dome has an open lower end for receiving the flat upper free end of the post therein whereby pressure from the plunger portion will force the rubber dome upwardly within the shell thereby urging excess air within the liner to be expelled outwardly through a nipple of the baby nurser.