How to Measure Flange Size: Complete Flange Size Guide - Momcozy

The flange is the breast pump part that comes in contact with your body when placed onto the breast and nipple, forming a vacuum seal with the areola. It's shaped like a funnel. The flange draws your nipple into the tunnel of the pump where milk is extracted.

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Flanges are typically made of plastic or silicone and come in various sizes to accommodate different nipple dimensions.

Some breast pumps come with multiple flange sizes or offer smaller inserts or cushions to customize the fit within the flange. This reduces the opening of the tunnel where the nipple enters and allows for a more comfortable and effective pumping experience.

Whether the shield or flange size of your breast pump is right or not greatly affects your breast comfort and milk output. A properly fitted flange maximizes milk output, prevents nipple damage, and ensures effective milk pumping. If you want to ensure the most amount of milk during your pumping and comfort during and after pumping, measuring your nipple size accurately is very crucial.

Flange sizes typically range from 13 to 36mm, depending on brand. This measurement refers to the beginning of the flange tunnel, not the flange opening. Momcozy breast pumps include a standard 24mm flange and offer additional 27mm flanges for moms with larger nipples. We also provide inserts ranging from 15mm to 21mm to accommodate a variety of nipple sizes.

Your nipple should comfortably fit within the flange tunnel without rubbing or pinching. It should fit snugly inside the tunnel of the flange.

If the flange is too small, your nipple might rub against the sides of the flange causing discomfort. If the flange is too large, the areola may be sucked in, which can reduce milk output and cause pain.

Step 1: Stimulate your nipple to make it perk up.

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Step 2: Hold the ruler perpendicular to your breast, align the 0 mark with the base of your nipple, and make sure the edge of the ruler touches your areola.

Step 3: Measure the distance in millimeters from the base to the top of your nipple — that’s your nipple size.

Step 1: Stimulate your nipple to make it perk up.

Step 2: Try inserting your nipple into the sizing holes one by one to find the one that fits comfortably. Your nipple should be able to pass completely through the hole, and the edge of the ruler should touch your areola at the same time.

Step 3: Note the size marked on the hole that fits best — that’s your nipple size.

Momcozy includes a handy nipple ruler with holes in the breast pump set to make measuring a breeze. Please note that your left and right nipples may have different sizes, so please measure them both to get the exact size.

We recommend adding 1-3mm to your nipple measurement to determine your ideal flange size. Because nipple size can fluctuate when pumping, choosing a flange 1-3mm larger often provides a more comfortable fit. For personalized guidance, refer to our flange size chart below.  

Remember, every mom is unique. While a 1–3 mm adjustment works for many, it's essential to pay attention to how your body responds during pumping. It's okay if your nipple touches the side of the flange tunnel, but excessive rubbing or discomfort is not. If you experience any issues, don't hesitate to try a different size.

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