Abstract: A nipple end-piece adapter is disclosed for a bottle having a threaded neck, and further comprising an inner threaded chimney on one end of the adapter, adapted for cooperating with the thread of the neck of the bottle, a sidewall on the other end of the adapter also threaded for receiving the ring of the end-piece and, in addition, a skirt connected to the chimney, shaped and positioned so that it cooperates sealingly with the internal face of the neck of the bottle when the adapter is fixed thereon by screwing its chimney on the neck. The adapter is configured to act as an extension of the bottle neck, thereby creating a neck which an infant or toddler can easily grasp, and making it accessible for a caregiver to disassemble for cleaning.