Wombaroo Feeding Bottle 120ml (teats sold separately). A wide range of latex teats are available with a sleeve to fit bottles with a neck diameter of 18-24mm. This bottle is suitable for all sizes of wombaroo teats. Teats should resemble mothers’ in shape and length for mouth comfort, fit and correct tooth eruption. Marsupial teats get longer as the joey grows, so progression to longer teats is important. Suggested uses for the various teat sizes and shapes can be found on the picture attached, however individual carers will be able to decide which is the best for their individual animal.