Bit of background: DS (14 mo) was EBF until 6 months old, when he became seriously ill. A side-effect of his treatment was that he lost his appetite (including for bf) and had to be partly tube-fed for 5 months. At first this was with EBM but after a while my supply dropped so much that we had to supplement this with a special high-calorie formula. He continued to bf sporadically (mainly for comfort, I think) but by the time he was a year old, he only had two bf a day - first thing in the morning and last thing at night.
He's now eating and drinking (cow's milk) normally, as well as having these two bf each day. However, for the last month or so he's been biting me at most feeds, but especially in the evening. I've tried various things - calmly unlatching him and saying 'no', ignoring it (ow!), waiting to feed him until he is calm and drowsy - but nothing seems to work. He just thinks it's really funny to bite on my nipple and then pull his head back to draw it through his teeth. (He has 9 teeth, so this is not trivial - although it doesn't hurt that much because he's not really biting down hard. I thought it was teething-related initially, but he does it every single feed now, sometimes after 30 seconds or so.) Recently, I've been just stopping the feed as soon as he does this, to let him know that it's not really on. He gets one more chance after five minutes but if he keeps biting me, we just miss out that feed. But this means that he doesn't get a feed (and I'm worried that my supply will dwindle even more). I guess if he really wanted to feed, he would, so this is effectively his way of saying that he would rather muck around than get some milk? Has he had enough of bf already? Has all the tube-feeding and formula topping up and general disruption 'ruined' bf for him? 