On this page:

  • Sizing
  • Pump Compatibility
  • Cleaning & Sanitizing
  • Lubrication
  • Quick Start
  • Tutorial Videos
  • Troubleshooting

📏 Sizing

To size Cushy: measure your nipple base, then add 0–4mm. Most moms land at +2mm.

First try the flange with your exact measurement, or round down if you're an even size. If not comfortable, try the next size up.

Example:
Nipple base measures 18 mm → try 17 & 19 mm flanges as the first two options.

See Flange Fit Guide (with printable ruler)

Not sure of your size?

Try 3 sizes for the price of 2

🍼 Pump Compatibility

Your pump isn't listed? Contact us.

💧 Cleaning & Sanitizing

  • Before First Use

    • Disassemble all parts
    • Wash in warm soapy water
    • Rinse well with clean water
    •  SUBMERGE PARTS IN A LARGE POT OF WATER AND BOIL FOR THREE (3) MINUTES. This step is crucial to maximize your flange's suction performance.
    • Shake off excess water and air-dry on a dedicated rack or clean cloth

  • After Each Use

    • Separate the flanges from the base connector
    • Wash in warm soapy water
    • Rinse well
    • Shake off excess water and air-dry on a dedicated rack or clean cloth
    • Do not wash in the dishwasher. This can damage your flanges and shorten their lifespan.
    • Cushy Flanges CAN be washed in baby bottle washers.

  • How to Sanitize

    For the longest lifespan, we recommend UV or cold-water sterilization. These methods are gentler on silicone and help your flanges last longer.

    UV Sterilizer for Pump Parts

    Cold Water Sterilization Liquid

    Can I sanitize in the baby bottle washer?

    Yes, steam sterilization is safe but it will shorten the life span of your flanges.

  • Do I Need to Replace Cushy Silicone Flanges?

    If you use cold water or UV sterilization, you do not need to replace your flanges for at least a year.

    If you do use steam sterilization and notice weaker suction, slipping, or the silicone feels less supportive, it’s time to replace them. How often you need to replace them will depend on how frequently you pump.

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🧴 Lubrication

If Cushy feels sticky or uncomfortable at first, try a small amount of:

• pumping spray
• olive oil
• coconut oil

Most moms only need this during the first few weeks until they get used to the silicone.

Get CoBoo Pumping Spray →

🏁 Quick start: get your best seal

  • Step 1. Check your connector

    Make sure you have the right base connector (check above)

  • Step 2. Twist + push into the base

    Insert Cushy firmly for a secure fit

    Watch How to Twist & Push 

  • Step 3. Add lubrication if needed
    Use a little spray, olive oil, or coconut oil if the flange feels sticky or painful

    Buy Pumping Spray at 15% Off 

  • Step 4. Use the flip-back trick
    Position the flange on the nipple, then flip back for a snug seal

    Watch How to Flip Back 

  • Step 5. Start pumping
    You may need slightly higher suction than with plastic flanges.

▶️ Prefer to watch? Here are our step-by-step Cushy tutorials.

🔧 Troubleshooting

My flange feels loose

Twist and push it more firmly into the base connector.

My output dropped

Try increasing suction slightly. Silicone absorbs some vacuum.

My nipple rubs the tunnel

You may need a larger size.

The flange slips

Try the flip-back trick for a more secure seal

I’m not sure I have the right connector

Check the compatibility section above or contact us.

Something still doesn't feel right?

If your fit, seal, or comfort still feels off, we’re happy to help.

Contact us

Need another size or spare set?

Shop Cushy FlangesAdd a spare or second size (50% off)