just found out flange size should be changed based on nipple size
Using M6. In the first week, I used smaller size, and then in the 2nd week, I had to change to larger size to fit. didn’t know this could change over the time.
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I just recently learned that it can change over time I didn’t know either
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Yes it can change. Also certain pumps can be different too. It all depends on the material and how your body adapts to it
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Me too 
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Yes it can change over time and not all flanges fit the same it’s wild