Breast pump flange fit: where to start

What is a flange?

The flange, or breast shield, rests against the breast with the nipple in its central opening. Included sizes are options, not a personal fit assessment.

Center the nipple comfortably without pinching, pulling or irritation. Start an electric pump at its lowest setting and adjust to a comfortable level within its instructions.

FDA shield positioning and starting settings.

Flange or insert: what are you buying?

The size label alone does not tell you which part you are buying. Some setups change the whole flange; others use a replaceable sizing insert.

Whole flange: Spectra S1 Plus

The US kit includes pairs of 24 mm and 28 mm flanges. Switching between these supplied sizes means changing the flange. Spectra’s included parts.

Insert: optional Pumpables Liquid Kit

With Genie Advanced’s optional bottle-based Liquid Kit, change size by replacing the silicone insert inside the shield assembly, keeping the rest of the kit. A replacement pack contains two inserts, not two complete kits. These inserts fit Liquid Kit only, not Liquid Cups or other shield systems. Genie’s kit options; replacement insert details.

Before you order

Match your exact collection kit, part name, compatible size and quantity. Compatibility does not choose your personal fit; a measurement or accessory from another brand may not transfer to your model.

Note the pump, shield or insert, and setting used so you can explain any discomfort when seeking help.

Use a simple fit conversation checklist

• Which shield and insert are fitted?
• Does assembly match the manual?
• When does discomfort start?
• Is it on one side or both?
• Have settings or parts changed?

Bring these details to a qualified lactation professional who can observe a session. They help describe the problem; they do not diagnose it or establish a universal size or suction setting.

Comfort comes before stronger suction

Stop if pumping hurts. Do not keep increasing suction to push through pain. Get qualified help for persistent pain, damage or concerns about milk transfer.

Before buying, check that compatible fit options are available. Compare the listed shields and inserts in the pump comparison.