In the event it's not causing any pain, problems still could arise down the line if breast drainage is not optimal, leading to delayed onset low milk supply.Īn easy way to tell if your flange is too big is that your areola will be pulled into the breast flange tunnel. If your flanges are too big, pumping will likely be uncomfortable. Most people increase in nipple diameter the days following birth, so if you measure prenatally, keep that in mind. Please note: Nipple size changes after delivery and during lactation. In this case, measure the diameter (from one side to the other) of the widest part, and you should get an accurate measurement for what flange size you need. Nipples come in a variety of shapes and sizes, and for some, the widest part of the nipple is NOT the nipple base. Where the nipple attaches to the areola-the pigmented area surrounding your nipple- tends to be the widest part, which is where you want to take the measurement.

Many people struggle with knowing what part to measure- you measure the 'nipple button,' which is the part that sticks out when you're cold (or horny). To know your flange size, you measure from one side of your nipple to the other and then add 1-3 mm depending on when you measure it (before or after pumping). Your flange size is determined based on the measurement of your nipple base. So I'm here to answer the most common questions regarding flange sizing! Proper sizing is key to both pumping comfort and long-term milk-removing success. A stat that I know for certain: Using a properly sized flange may increase your pump output by 20%.

Measuring flange size spectra