The Bean Stork Tritan bottle comes with one nipple, no size change needed. The Pigeon Mother's Heart bottle is glass and has a size M nipple. Both were only used a few times. The Pigeon Mother's Heart bottle comes with one new SS nipple and one new L nipple (the L nipple is without a box or outer bag, as it has been opened). As they are rubber products, there is some yellowing, although they were used infrequently.