I'm having trouble trying to figure out what size breastshield works best for me. I know, sounds silly, but the truth.
How much does the WRONG sized breastshield affect pumping output? I know your nipple is not supposed to rub against the sides of the shield, but how much of the area around the nipple should move inside the shield?
Sorry if I sound ignorant...
Thank you, as always, for your input!