Abstract: A device for making, or enlarging, an opening in the tip of a rubber baby bottle nipple. One embodiment of the device has a lancet which can be selectively extended from a housing to cut an opening in the tip of a nipple. Alternatively, the lancet may be fixedly extended a predetermined distance from the housing and the nipple pushed onto the exposed end of the lancet by compression of a hinged, U-shaped handle. Other embodiments of the invention comprise a freestanding structure having the shape of a baby bottle nipple with a blade either mounted in a socket attached thereto on a flexible arm or string or in the structure itself.