Yes....this has happened to me. One breast is visibly larger than the other.
I'm pretty sure it's because since DD was about 10-12 months old we moved the bedside cot away and she sleeps in the middle of the bed, and I've probably ended up feeding more often from the breast next to her.
I had no idea it would make this much difference!
She's now 16 months and I've been trying to switch back to the other side to even things up, but now the big one seems to be her favourite and she's quite insistent.
Anyone else had experience of this? Please??!