The boiling method is the original, time-tested way to sterilize baby feeding equipment. It requires no special gadgets, is completely free, and is recommended by health organizations worldwide for its effectiveness in killing over 99.9% of harmful germs. This simple process uses a rolling boil to ensure your pump parts are safe for your baby.

With just a pot and water, you can have fully sterilized parts in about 5 to 10 minutes, plus drying time. It’s a straightforward technique that’s easy to master, and it’s a cornerstone of the sterilization options covered in our How Long and Methods Overview.

Getting started with the boiling method is simple. You likely already have everything you need in your kitchen.

• A large pot with a lid: It should be big enough to hold all the pump parts and allow them to float freely. It’s best to use a pot dedicated only to sterilizing your baby’s feeding items.
• Plenty of clean water: Enough to cover all the parts completely.
• A stove or cooktop.
• Clean tongs: For safely removing the hot parts from the water.
• A clean, unused dish towel or paper towels: For air-drying the parts.

Follow these steps for a safe and effective sterilization cycle. Remember to always start with parts that have already been washed with hot, soapy water.

1. Fill the Pot: Place your clean, disassembled pump parts into the large pot. Add enough water to cover them completely, ensuring no part is left exposed. The parts should be able to float freely to avoid touching the hot bottom or sides of the pot.
2. Bring to a Boil: Put the pot on the stove over high heat and bring the water to a full, rolling boil. You can place the lid on the pot to help it boil faster.
3. Set the Timer: Once the water reaches a rolling boil, set a timer for 5 to 10 minutes. The CDC recommends boiling for at least 5 minutes. Let the parts boil for the entire duration. Do not leave the pot unattended during this time.
4. Remove the Parts: After the timer goes off, turn off the heat. Use clean tongs to carefully remove each part from the boiling water. Be careful to avoid splashing yourself with hot water.
5. Air-Dry Completely: Place the hot parts on a clean, unused dish towel or fresh paper towels in an area protected from dust and dirt. Allow them to air-dry completely before reassembling or storing them. Do not use a dish towel to wipe them dry, as this can reintroduce germs. For more on this, see our guide on post-sterilization handling.

Boiling water requires your full attention. Keep these safety tips in mind to prevent accidents.

• Never leave a boiling pot unattended. Stay in the kitchen while you are sterilizing.
• Use tongs to handle parts. The parts and the water will be extremely hot. Tongs help prevent burns.
• Keep children and pets away from the stove while you are boiling.
• Avoid over-crowding the pot. If parts can’t float, they may rest against the bottom and melt or warp. If you have many parts, it’s better to sterilize them in two separate batches.
• Let parts cool slightly on the drying towel before you handle them directly.

• Mistake: Parts are melting or warping.
• Cause: The pot is too small, there isn’t enough water, or the parts are resting against the hot metal bottom of the pot.
• Fix: Use a larger pot with more water so everything can float. Some parents place a wire rack at the bottom of the pot to prevent direct contact.
• Mistake: White, chalky film on parts after boiling.
• Cause: This is usually due to hard water mineral deposits (limescale), which are harmless.
• Fix: You can add a tablespoon of white vinegar to the boiling water to help prevent mineral buildup. The film can be wiped off with a clean cloth.
• Mistake: Not disassembling parts completely.
• Cause: You left the valves connected to the flanges or the membranes inside the connectors.
• Fix: Always take every single piece apart before washing and boiling. This ensures that the hot water reaches every surface, which is a fundamental concept in our Sterilization Basics: What, Why, and Need guide.

The boiling method is a simple, effective, and reliable way to keep your pumping equipment safe for your baby. Now that you’ve mastered this technique, you can feel confident in your cleaning routine.

To compare this method with other options like microwave bags or electric sterilizers, you can return to our How Long and Methods Overview. For guidance on when and how often to perform this task, check out our guide on when to sterilize, or learn how to properly store your clean parts with tips from our article on post-sterilization handling.