These 2 count wide neck teats are compatible with Pacific Baby All-in-One Thermal Baby bottles. They are made out of high grade soft silicone and designed with the natural shape of a mother’s breast in mind. The medium teats are suitable for babies aged approximately 3 months and up. When you baby is ready to move up to the next teat stage the medium teat can be replaced with the fast flow. The teats are BPA and PVC free and have passed the relevant safety tests. Always test the temperature of liquid before feeding your child.