Before first use, and at regular intervals thereafter, boil the soother in water for up to five minutes. Please avoid leaving the soother in the sterilising solution for longer than the time recommended. Sometimes water may enter the inside of the teat, this is because of a ventilation system that exists in the nipple and helps make the soother orthodontic.
When the baby closes down on the teat, the air from inside the teat is pushed out through the ventilation system thereby flattening the teat and adapting to the baby´s individual oral cavity. So, the ventilation hole is needed in order to allow for proper development of your baby's jaw and mouth.