Uncommon flange size - do I size higher or lower?

jv

I measured my nipple and came out 20mm perfect (used those flexible ones on Amazon). Now there isn’t much in the way of 20s. I use 21 now and my pump time is long but not sure if 19 would impede milk flow and damage nipple. Suggestions?

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors