I nursed my daughter for the first 6 months of my second pregnancy, until she was exactly 2. Then it started to feel very physically uncomfortable to nurse her. Since she was mostly just nursing at night, I just started sleeping in another room (she still co-slept with daddy on the firm bed and I moved to the guest room with very comfy bed, which was great when I was 6-9 months). Since my breasts weren't near her at night, she didn't seem to miss it. After a month, she asked during the day to nurse and I let her but she has forgotten how and that was that.
I really did want to do self-led weaning with her, and wish things could have gone that way. But it seems to have turned out fine. And I did child-led weaning with my son, who stopped nursing completely sometime over this past summer (the frequency just got less and less until one week I realized he hadn't asked in days). It was very natural and easy. He was 2.5. I hope to do the same with this 3rd one. On a cute note, when my son catches sight of my "foondies", he'll say "I love your foondies" and always wants to say hi to them. So he still has some relationship with them and I expect that will change when the new baby starts to use them.
Just one of those Wonderful Mysteries.... 
