Properly storing breast pump parts comes down to two things: making sure they’re completely dry before putting them away, and keeping them in a clean, dust-free space. The details matter more than you might expect, because even small amounts of trapped moisture can encourage bacteria or mold growth on the parts that directly contact your milk.
Drying Before Storage
The most important step happens before storage even begins. After washing, place all pump parts on a clean, unused dish towel or paper towel in an area protected from dirt and dust, and let them air dry completely. Don’t rub or pat parts dry with a towel, even a clean one. Dish towels can harbor bacteria that transfer right back onto freshly cleaned surfaces. This applies to flanges, valves, membranes, bottles, and connectors alike.
Tubing needs special attention. If you notice condensation inside the tubing after a pumping session, keep the pump running for a few minutes with just the tubing attached (no other parts) to blow air through and evaporate the moisture. Tubing that stays damp inside is a prime spot for mold. If mold does appear, or if the tubing stays cloudy after cleaning, replace it. Clean tubing only with alcohol (not water) if residue or condensation gets inside.
Where to Keep Clean Parts
Once everything is fully dry, store parts in a clean, enclosed container. A dedicated storage bag, a sealed plastic bin, or even a large zip-top bag works well. The goal is to keep dust, pet hair, and kitchen splatter off surfaces that will touch your milk. Avoid storing parts loose in a drawer or on an open countertop where airborne particles can settle on them between uses.
If you’re using a pump bag or tote, make sure the storage compartment itself stays clean. Wipe it down periodically. A dirty bag defeats the purpose of washing and drying parts carefully.
The Refrigerator Hack
You’ve probably heard about putting unwashed pump parts in the fridge between sessions to save time. The idea is that cold temperatures slow bacterial growth enough to skip washing until the end of the day. The CDC does acknowledge that if you can’t clean parts thoroughly after every session, you can rinse them and refrigerate for a few hours between uses. But this comes with important caveats.
Refrigeration slows bacterial growth. It doesn’t stop it. Rinsing alone won’t fully remove milk residue, which gives bacteria something to feed on. If you use this shortcut, keep your fridge at 4°C (40°F) or below, and use the parts within 24 hours before doing a full wash. Place them in a clean, sealed bag or container inside the fridge rather than setting them on a shelf uncovered.
This method is not recommended if your baby is under 2 months old or has a compromised immune system. For those babies, wash all parts thoroughly after every single session.
Storage Solutions for Work and Travel
Storing and cleaning pump parts at work takes some creative planning, especially if you don’t have easy access to a sink. The CDC suggests several practical approaches. Bring multiple pump kits so you can use a fresh, clean set for each session and wash everything at home at the end of the day. If your workplace has a microwave, rinse parts and use microwave steam bags designed for pump parts (check your manufacturer’s instructions first, since not all parts are microwave-safe).
Between sessions at work, store used parts in a sealed bag in the office fridge, following the same refrigerator guidelines above. Keep clean backup sets in sealed bags inside your pump tote. A small drying rack that fits in your bag can be useful if you do have sink access and want to wash and air dry on site.
Stricter Rules for NICU Babies
If your baby is in the NICU, your unit will likely give you specific cleaning and storage instructions that go beyond standard guidelines. Follow those over any general advice. Common NICU protocols include not using a dishwasher to clean parts unless the NICU has approved it and your pump manufacturer allows it. You’ll also want to avoid combining milk from different pumping sessions, and freeze any pumped milk that won’t be used within 24 to 48 hours (your NICU team will specify which timeframe they follow).
When to Replace Parts
Even with perfect cleaning and storage, pump parts wear out. Worn silicone loses its seal, which drops suction and makes pumping less effective. If you notice weaker suction during a session, the valve or membrane is usually the culprit.
- Valves and membranes: Replace every 2 to 4 weeks if you pump four or more times a day. For less frequent pumping, every 2 months is sufficient.
- Tubing: Replace if cleaning doesn’t remove residue, if mold appears, or if it stays cloudy after washing.
- Flanges and bottles: Inspect regularly for cracks, discoloration, or warping. These last longer than small silicone parts but should be replaced at any sign of damage.
Keeping a spare set of valves and membranes on hand saves you from discovering a worn-out part mid-session with no backup. Many parents buy replacements in bulk since these small parts are the most frequently swapped components of any pump kit.