The Complete Guide to Sanitizing Baby Bottles, Pacifiers and Pump Parts

TL;DR

• Thoroughly wash baby bottles and breastfeeding pump parts after each feed and/or pumping session. Sanitization (an additional measure aimed at killing potential bacteria) needs to be performed once a day or even more often for newborns and preemies under 3 months of age. The following steps will get rid of residues and contaminants: disassemble bottles and pump parts, rinse under running water, wash separately in a basin with soapy hot water, sanitize by boiling or using a dedicated sterilizer, and leave to air dry.

There are many things you're doing now to protect your little one from harm. There's one step you might have overlooked, however. Washing newborn bottles  with soap and water doesn't guarantee that they are sterile. The point is washing gets rid of visible contamination and milk residues only, but sanitizing does way more, kills off all bacteria left by the previous wash.

That's why if your baby is a newborn or has a weak immune system due to prematurity or being born underweight, it's crucial that bottles are sanitized in addition to washing. When it comes to

Step 1: Clean Everything First (This Part Can't Be Skipped)

No sanitizing method works properly on dirty surfaces. Before you sterilize anything, you need to clean it thoroughly.

1. Disassemble completely: Take apart every bottle, nipple, cap, valve and pump component. Milk residue hides in the pieces you don't pull apart.
2. Rinse under running water: Don't drop parts directly into the sink, because sinks harbor bacteria. Rinse each piece individually under the tap.
3. Use a dedicated basin: Fill a clean basin (not the sink) with hot water and a good baby bottle cleaner or dish soap. Scrub everything with a bottle brush.
4. Squeeze soapy water through nipples and valves: This is the step most people miss. Push soapy water through every hole and valve opening to flush out trapped milk.
5. Air dry on a clean rack or unused towel: Resist the urge to dry parts with a dish towel, that transfers more germs than it removes.

Step 2: Choose Your Sanitizing Method

After washing and rinsing, it is now time to sanitize your bottles and accessories. Below are some of the most effective techniques on how to sanitize baby bottles and their accompanying accessories.

Boiling Water

The age-old technique of boiling water. Put the pieces of the bottle and its accessories in a pot of water, cover them and let them boil for about five minutes. It is simple, effective and requires no additional equipment.

Steam Sterilizer

A quick way to sanitize bottles and accessories using electric steam sterilizers or microwave steam bags. The sterilization process takes just a couple of minutes. Just be sure to disassemble all items before putting them inside.

Dishwasher

Can baby bottles be sanitized in the dishwasher? Yes, but only if your dishwasher offers a high-temperature wash cycle and a heated dry cycle or a sanitizing cycle. To ensure that all parts of your bottle fit into the dishwasher, use a small appliance basket for nipples, valves and caps so that they will not fall to the bottom of the appliance.

UV Sanitizer 

UV-C sanitizers use ultraviolet light to help eliminate bacteria and other microorganisms without heat or moisture. Unlike boiling or steam methods, UV sanitization leaves bottles, pump parts and pacifiers completely dry after the cycle finishes, which can help reduce moisture buildup during storage.

Many parents prefer UV-C systems because they are fast, low-maintenance and easy to run overnight or between feedings. Some devices can sanitize bottles, nipples, pacifiers and breast pump parts in just a few minutes while also functioning as a clean storage space afterward. As with any sanitizing method, items should still be thoroughly cleaned first using hot soapy water before beginning the UV-C cycle.

How to Sanitize Pump Parts

Breast pump components need just as much attention as bottles. Maybe more, since they're in direct contact with milk every single session. Here's what how to sanitize pump parts looks like in practice:

• Clean pump parts after every single use. Don't let milk sit in valves or tubing.

• Pay special attention to bottles, valves, and the pump kit itself.

• Sanitize the full kit at least once a day using any of the methods above.

• If you're using a feeding bottle sanitizer or steam sterilizer, confirm that your pump parts are rated safe for that method, most are, but it's worth checking the manufacturer's guidelines.

A quick tip: tubing generally doesn't need to be sanitized unless milk has gotten inside. If it has, replace it, tubing is difficult to dry properly and mold can develop.

Pacifiers Need Daily Attention Too

Pacifiers follow the same rules. Sanitize them daily by boiling or using a steam sterilizer. Between sanitizing sessions, rinse with hot water after each use. And never "clean" a pacifier by putting it in your own mouth, that transfers adult oral bacteria to your baby.

Don't Forget the Tools Themselves

Your bottle brush and washing basin can become germ hotspots if you're not careful. Sanitize them regularly using the same methods you use for bottles. A dirty brush defeats the whole purpose of scrubbing.

Storage: The Step That Completes the Process

All that cleaning means nothing if the parts end up in a contaminated space. Before storing:

• Make sure every piece is completely dry. Even a small amount of trapped moisture can lead to mold growth inside assembled bottles.

• Store in a clean, covered container or a dedicated space that's protected from dust and kitchen splatter.

• Don't reassemble bottles until they're fully dry.

How Often Should You Be Sanitizing?

For newborns, preemies and babies with weakened immune systems: Sanitize at least once a day, more if possible. For healthy babies over 3 months, thorough cleaning after every use may be sufficient on its own, according to Texas Children's. But daily sanitizing is never a bad habit to keep.

The rule of thumb: when in doubt, sanitize. It takes a few minutes and removes any guesswork.

A Note on Building the Habit

The biggest challenge with all of this isn't knowing what to do, but building a routine that happens automatically, even during a 3am feeding or a particularly exhausting week. A few practical approaches that help:

• Keep your dedicated washing basin and bottle brush right next to the sink, not stored away. Visibility reduces friction.

• Pair your daily sanitization cycle with something that already happens, loading the dishwasher at the end of the day, the baby's bath time or charging devices before bed.

• For families using UV sanitization, a device like PhoneSoap's HomeSoap doubles as storage. Because items come out completely dry and germ-free in 10 minutes, the sanitizer itself can serve as the overnight holding spot for pump parts, bottles and pacifiers, no separate drying rack needed. 

The goal isn't perfection every single session. It's a reliable system that works most of the time and makes the safe choice the easy choice. 

Frequently Asked Questions

How to sterilize baby bottles, pacifiers and pump parts?

It begins with thorough cleaning in hot soapy water utilizing a basin and brush made for bottle cleaning. Sterilize using either one of three methods: 5-minute water boil, using a steam sterilizer machine (electric or microwave) or run a hot-water dishwasher cycle. Disassemble everything properly before sanitation and let dry before putting away.

Do you really need to sterilize baby bottles and pump parts?

Absolutely, at least during the first few months. Cleaning gets rid of visible dirt but sterilization helps to get rid of bacteria. It is critical to sanitize if you have newborn babies, preemies and children with compromised immunity. For healthy babies over 3 months old, you might consider washing bottles after each use to be enough, although, sanitizing is always recommended.

How often should I sanitize baby bottles and pump parts?

The very least would be once per day. If your baby is an infant, especially if it is a newborn or a preemie, you should be sanitizing your bottles as often as possible. For breast pump parts, wash thoroughly after each session and sanitize at least once a day.

Can I use Dawn dish soap to clean pump parts?

Yes, using Dawn and other common dish soaps for cleaning pumps, bottles, and nipples is perfectly fine. You just have to make sure that you have your own separate container for cleaning, scrubbing them well with a new brush and rinsing off everything before disinfecting.