i think the ones that came with my medela pump may be the wrong size.

when i look at the pictures online, my nipple doesn't even come into the tunnel when it's at rest. this would indicate that i need smaller breastsheilds, right?

however, when i begin pumping, my nipple rubs against the side of the tunnel.

not sure what to do.

i used this guide: http://www.medelabre...ing%20Image.pdf