What size flange?!! Breast pic

Jazmine • FTM to Summit Rae

Help! I was told 24mm was too big bc areola was too much in flange but this pic is 20mm and I still feel like nipple rubs the side too much when I pump longer and some of areola still is in flange. I constantly adjust nipple and o not rub sides but I did it with 24 too. Is the 20 mm pic ok?