G.W.
I nursed my son till he was 18 months, and had the same problem. I started to give him a blanket at night and when we nursed. I then told him that Mommy milk as he called it was for baby's and that he was a big boy. I also told him that if big boys had mommy milk that it was an ouch, I then put bandaids on my breast.That night when he went to nurse i told him it was an ouchie, he saw the bandaids and realized it was and ouchie. after that night he hasn't nursed. Good luck and GREAT job on extended breastfeeding