2018 Year of the Dog 2021 Year of the Ox I have used about 10 Betta baby bottles at random, and both have been used for 6-8 months. The Dog bottle has small scratches, and the Ox bottle has small scratches and some print missing. At daycare, I used a milk warmer, and at home, I used Milton soaking sterilization. They show signs of use, but they are limited edition bottles, so I couldn't throw them away. If you don't mind, they are suitable for a spare.