24mm Flange Kit: Sizing and Usage Guide

By BabyBuddha Breast Pumps & Accessories – BabyBuddha | Published: 2026-10-19

Category: Product Reviews

Learn how to use and size a 24mm flange kit for your breast pump, including setup tips, common mistakes, and when this size fits best.

Quick answer

Use the 24mm flange kit if your nipple diameter is about 15–17 mm. Ensure a centered fit with no rubbing, and replace flanges every 6–12 months for best suction and hygiene.

Why correct flange size matters

A properly sized flange prevents nipple pain, low milk output, and clogged ducts. Too small a flange pinches the nipple; too large pulls in areola tissue, reducing suction efficiency. The 24mm size is a common mid-range option suitable for many users.

When 24mm might not work for you

If your nipple diameter is under 14 mm or over 18 mm, the 24mm flange may cause discomfort or poor milk removal. In those cases, consider smaller or larger flange sizes. Also, if you have elastic nipples, you might need an insert or a different flange shape.

How to use a 24mm flange kit

1. Measure your nipple diameter: Use a flange sizing tool or a ruler to measure the base of your nipple (not the areola) after pumping or when the nipple is erect. Aim for a diameter of 15–17 mm for a 24mm flange. Common mistake: measuring the areola instead of the nipple. Check the nipple base only.
2. Attach the flange to your pump: Align the flange opening with the breast pump connector. Push firmly until it clicks or fits snugly. Ensure the massage cushion (if included) is placed correctly inside the flange. Checkpoint: a loose connection can cause suction loss. Test by covering the flange opening with your palm and turning on the pump.
3. Center your nipple in the tunnel: Place the flange so your nipple is centered and moves freely without rubbing the sides. The areola should be mostly outside the tunnel. Common mistake: off-center placement leads to friction and pain. Adjust the flange position during pumping if needed.
4. Start pumping and observe fit: Begin with a low suction level. Watch for nipple movement: it should glide without hitting the sides. If you see areola tissue being pulled in, the flange may be too large. Checkpoint: if you feel pinching or see redness, stop and re-measure. Consider trying a different size.
5. Clean and replace regularly: Wash the flange kit after each use with warm soapy water or in the dishwasher (top rack). Replace flanges every 6–12 months or sooner if they become cloudy or cracked. Common mistake: using worn flanges can reduce suction and harbor bacteria. Mark a replacement date on your calendar.

Product facts

24mm Flange Kit: Our Flange kits include massage cushions. The flange (breast shield) is a funnel-shaped piece that fits over your nipple to form a seal and create a vacuum for milk removal. Replace breast pump flanges every 6–12 months. The included massage cushions can improve comfort and milk flow, and regular replacement ensures consistent suction and hygiene.
24mm Flange Kit