A device for forming an opening in a nipple of a baby bottle has a housing having a platform formed on a top surface thereof. a cutting unit is positioned on the platform. The cutting unit moves in an up and down manner forming the opening in the nipple. A holding device on the platform has a base and a cutout formed in a top surface of the base holding the nipple there within. The cutout is formed to hold the nipple so that an area of the nipple where the opening is formed is positioned in a bottom area of the cutout. A slot is formed in a bottom section of the cutout and extending through the base, the slot allowing the cutting unit to penetrate through the nipple and into the slot. The cutting unit contacts and stretches an interior wall of the nipple where the opening is to be formed reducing disfiguration where the opening is formed. When the cutting unit is withdrawn once the interior wall has been penetrated therethrough, the interior wall of the nipple where the opening is formed returning to an initial non-stretched state.