Abstract: A disposable non-reusable baby bottle provides a container having a rigid flange at the container's open end, a nipple having a radially enlarged flange, and a snap ring which locks the nipple to the open end of the container. The nipple is invertible between a storage position wherein the nipple extends into the container and a ready-to-use position wherein the nipple is accessible to a nursing infant. The snap ring includes a snap ring sealing ridge which protrudes into the radially enlarged flange of the nipple to increase resistance to removal of the nipple following use. In an alternate embodiment, the container rigid flange includes a second sealing ridge which protrudes into the radially enlarged flange of the nipple to further increase resistance of the nipple to removal. A safety seal prevents contamination of the nipple by covering the nipple when the nipple is in the storage position.