Keeping your breast pump clean is one of the most important tasks you’ll perform as a pumping parent. It ensures the milk you work so hard to express is safe for your baby.

But the process of cleaning and sterilizing can bring up a lot of questions. Are you washing correctly? How often should you sterilize? What’s the difference between cleaning and sterilizing anyway?

This comprehensive guide will remove the guesswork. We’ll provide clear, step-by-step instructions for daily cleaning and effective sterilization methods.

By the end, you’ll have a simple, reliable routine to keep your pump parts hygienic and your baby safe.

First, it’s important to understand that cleaning and sterilizing are two different, but equally crucial, steps.

• Cleaning is the physical act of removing milk residue and germs from surfaces using soap and water. This must be done after every use.
• Sterilizing is the process of killing virtually all remaining germs and bacteria, usually with heat or steam. This provides an extra layer of protection.

You cannot effectively sterilize a dirty item, which is why you must always clean parts thoroughly before you sterilize them.

The safest practice is to clean your pump parts immediately after every single session. Fresh milk residue is a breeding ground for bacteria, so timely washing is your best defense.

For this process, the Centers for Disease Control and Prevention (CDC) recommends using a dedicated wash basin and brush, not the kitchen sink, to avoid cross-contamination.

• A dedicated wash basin
• A bottle brush and a small detail brush (used only for pump parts)
• Mild, unscented dish soap
• A clean paper towel or a dedicated drying rack

You can also see our dedicated guide on What to Wash Breast Pumps With?

1. Wash Your Hands: Before handling pump parts, wash your hands thoroughly with soap and water for 20 seconds.
2. Rinse Immediately: As soon as you finish pumping, disassemble your pump and rinse all parts that touched your milk under cool, running water. This includes flanges, connectors, valves, and bottles.
3. Wash in a Basin: Fill your dedicated basin with hot water and soap. Do not place parts directly in the sink. Submerge all rinsed components.
4. Scrub Each Piece: Use your dedicated brushes to scrub every part. The bottle brush is great for bottles and flanges, while a small detail brush is essential for cleaning inside connectors and tiny valves.
5. Rinse Again: Rinse each piece under clean, running water to remove all soap.
6. Air-Dry Completely: Place the clean parts on a fresh paper towel or a drying rack. Allow them to air-dry completely before storing. Using a dish towel can reintroduce germs.

For more detail, see our guide: Cleaning Breast Pump Parts After Each Use.

While daily cleaning removes milk residue and most germs, sterilization goes a crucial step further by eliminating nearly all germs, bacteria, and viruses that could pose risks to your baby’s health.

This process is especially vital for newborns and infants with developing or compromised immune systems, as their bodies are far less equipped to fight off infections.

The Centers for Disease Control and Prevention (CDC) specifically recommends sterilizing breast pump parts daily for babies who are:

• Under three months old
• Born prematurely
• Have a weakened or compromised immune system

For older, healthy babies, sterilizing parts a few times a week still provides added reassurance that their feeding equipment remains as safe as possible.

Always be sure to sterilize all parts before their very first use, regardless of your baby’s age or health, to remove any potential contaminants from manufacturing or packaging.

This is the most accessible and cost-effective method for sterilization. It requires no special equipment besides a large pot.

How to Boil:

1. Place your clean, disassembled parts into a large pot.
2. Fill the pot with enough water to completely cover all the parts.
3. Bring the water to a rolling boil.
4. Continue to boil for at least five minutes.
5. Use clean tongs to carefully remove the parts and place them on a clean paper towel to air-dry.

These countertop appliances are incredibly convenient and use hot steam to kill 99.9% of germs in minutes.

How to Use:

1. Arrange your clean pump parts inside the sterilizer as directed by the manufacturer.
2. Add the recommended amount of water (usually a small amount for creating steam).
3. Turn on the cycle. Most cycles take between 5 to 15 minutes. Many models also have a built-in drying function, which is a huge time-saver.

These reusable bags are perfect for quick sterilization at home, at the office, or while traveling. They are an efficient and space-saving option.

How to Use:

1. Place your clean parts inside the reusable bag.
2. Add the amount of water specified on the bag’s instructions (typically a few ounces).
3. Seal the bag and microwave it for the recommended time, usually 2-4 minutes, depending on your microwave’s wattage. The steam created inside does the sanitizing work.
4. Let the bag cool before opening, and carefully remove the parts to air-dry.
   Keeping Your Parts Germ-Free

Your cleaning efforts are wasted if parts become contaminated during storage. Once your pump parts are completely clean and dry, they need to be stored in a protected area.

1. Confirm Parts are Bone-Dry: Storing even slightly damp parts can lead to mold and bacterial growth. Air-drying is best, but you can pat parts with a fresh paper towel if needed.
2. Use a Clean, Covered Container: Place the dry parts in a food-grade plastic bin with a lid or a large, resealable bag. This container should be used exclusively for your pump parts.
3. Choose a Safe Spot: Store the container in a clean, dry, and protected area, such as a kitchen cabinet away from the sink and any raw food preparation areas. Avoid leaving parts out on the counter or a drying rack for extended periods.

Learn more on storing clean breast pump parts here.

Building a reliable cleaning and sterilizing routine doesn’t have to be complicated.

By following these steps, you can ensure your breast pump is always hygienic and safe.

For more detailed information about maintaining every part of your breast pump, visit our comprehensive guide: Cleaning Breast Pump Parts.