My dd is 12 months and I am still nursing. Lately, for the past 2 weeks or so, it's been a bit uncomfortable when I do nurse her. I'm not sure what it is. It feels almost like soreness when she starts nursing and then has the other breast starts to fill, I can feel the soreness on that breast as well. The soreness is around the nipple area and not so much on the actual breast. Sometimes, even if she is not on the breast, they will start to feel uncomfortable. She does have a few teeth and I thought that maybe it was that, but I am not sure. Could it be something more serious?