LO is almost 13 mos and we haven't had any latch or biting issues since he was 6 mos old. But all of a sudden in the last week, my nipples are really sore! No visible injury, just tenderness. He has been teething on molars #2 and #3, and they just poked through a few days ago, and now I think he's working on #4. So for about two weeks it's been nightly nursathons (hourly wakings to nurse, or more) which is really wearing me out. Could the frequency of nursing alone be the issue? The other thing I've noticed during this time is that his latch is sometimes weird. I can't pinpoint anything specifically bad about it, it just seems kinda ... bitey? Not BITING me, but just kind of tight, and not relaxed (if that makes any sense), and when he stops nursing there are decent indentation marks from his teeth on the aureola. I make him re-latch so often, have him open wide and latch deeply, but it just reverts, even when it looks fine. I can't figure out how to "fix" this latch ... or do I just wait it out until these darn molars are done? Thanks for the insight ladies.