Abstract: A single-piece nipple to fit various sized beverage containers. The nipple fits over and seals to the top of standard water, juice, or soda containers that are available in supermarkets and other stores. The nipple enables children to drink directly from these containers without having to transfer the liquid to a bottle that is specially designed for children. The nipple includes a protuberance that is supported by a flexible base that has a wall for placement around a container mouthpiece. An aperture extends from the wall out through the protuberance creating a passage for liquid to flow from the container into the child's mouth. An attachment portion extends inwardly from the wall to seal the base to the mouthpiece of the container.