Instructions: Puncture the top of the nipple with a needle, or cut a small piece off the top. Be careful: too large opening in the nipple can cause choking. Do not allow young animals to chew on the teat. If an animal is chewing rather suckling, it has finished feeding and the bottle should be withdrawn. Sterilize the bottle and rubber nipple thoroughly after each use. If dish-washing liquid is used, rinse thoroughly afterwards.