How do I sterilize my Philips Avent pacifier? You can sterilize the Philips Avent pacifier by boiling it in water for 5 minutes. You can also sterilize certain Philips Avent pacifiers using the microwave. Find out more below. Sterilize your Philips Avent pacifier using the microwave You can sterilize the Philips Avent Ultra soft pacifier and the Philips Avent Ultra air pacifier in the microwave by using the carry case that comes with your pacifier. Instructions: Add 0.9fl.oz/25ml of water Place well-rinsed pacifiers into the case Microwave at 750-1000W for 3 minutes Leave to cool for 5 minutes Pour out water Note: Other Philips Avent pacifiers than the Ultra soft and Ultra air pacifiers cannot be sterilized using the carry case.