Check the sterilizer’s instructions to see if there is a specific type of water you need to use. Some sterilizers require you to use distilled water instead of tap water to avoid a buildup of mineral deposits inside the sterilizer. [2] X Research source

If you are interested in sterilizing a larger number of bottles at one time, check the sterilizer’s capacity before purchasing. [4] X Research source Some sterilizers will only hold a couple of bottles, while others may hold 9 or more.

Make sure that nipples and caps are placed in the sterilizer with their openings facing down. This will allow the steam to enter and sterilize the inside of the nipple or cap more effectively. [5] X Research source

Many electric steam sterilizers will also dry and deodorize the bottles for you. [7] X Research source Some electric steam cleaners are designed to keep the bottles sterilized for up to 24 hours, as long as the lid is kept closed during that time. If you don’t want to use the bottles right away, consider leaving them in the sterilizer. [8] X Research source

Many microwave sterilizers have a removable steamer rack on which to place the bottles and accessories. Remove this before filling with water, and then replace it. Check your user manual to find out if distilled water is recommended for your unit.

Never put anything metal in a microwave sterilizer. [11] X Research source Your bottles and accessories should be clean before you load them into the sterilizer.

Like many electric sterilizers, microwave sterilizers are designed to keep your bottles and accessories sterile for up to 24 hours if the lid is left on. [14] X Research source

You can purchase large food-grade buckets from most home supply stores. For cold water sterilization, the bottles and nipples need to be submerged. If you are using a microwave sterilizer with a steaming rack, remove the rack before using it as a cold water sterilizer.

Wash your hands thoroughly before taking the bottles out of the solution or use sterile tongs. You do not need to rinse the bottles after sterilizing. However, some babies may dislike the lingering smell and taste of the sterilizer. If you do wish to rinse, boil some water to sterilize it, and use that. [20] X Research source