The National Health Service of the United Kingdom recommends three methods: sterilizing bottles using a cold water sterilizing solution, steam sterilizing and sterilizing by boiling. Use hot, soapy water and a bottle brush to clean your baby's feeding bottle immediately after a feed. Wash the bottles in cold running water before sterilizing.
To sterilize bottles using cold-water sterilizing solution, the NHS recommends following the manufacturer's instructions and changing the solution every 24 hours. Immerse the bottles in the solution for 1/2 hour with a floating cover. Ensure that there is no air trapped in the bottles or teats when you place them in the sterilizing solution.
Steam sterilizing involves the use of an electric sterilizer or microwave, states the NHS. Check the manufacturer's instructions first, as sterilizers vary widely in usage, and read the manufacturer?s guidelines on the suggested duration of leaving out equipment before it needs to be re-sterilized. The openings of the bottles and teats should be facing downwards in the sterilizer.
When sterilizing by boiling, boil the bottles in water for around 10 minutes while regularly checking that the bottles and teats are not torn or damaged. Make sure that all items are under the water's surface.