Re: Biting and Teething...
When they are teething, it will sometimes cause strikes and biting. And, yes, they can get all 4 teeth in a relatively short period of time. Nursing and using a bottle are different and therefore when it hurts to nurse, it might not hurt to use a bottle. Also, he doesn't get any reaction from mom if he bites on the bottle. I found that it really helped to avoid getting bit to wait until DS showed he was ready/wanted to nurse when teething. And, yes, this was often much longer than usual. With your weight concerns, you might not feel comfortable doing this. You also might consider using something other than a bottle to supplement if needed so his sucking needs are only being met at the breast. We used a small, open cup some during strikes.
Try taking deep breaths and think about your milk flowing as you breathe out to help with a letdown.
Since it is very likely he is biting from teething, try giving him something to chew on before nursing. Then, if he bites, give him the teether/wet washcloth/etc again with a reminder that he can bite it but not mom.
At the end, take him off when he starts to slow down. Or, if you watch closely, you'll be able to pick up on a slight change in his jaw.
DS was always a quick nurser, but it became even faster when teething. Some babies like to nurse a lot when teething, but others, like ours, don't. Remember, this won't last, and he'll likely make up for it when the teeth come through.
Keep in mind this is happening because he's in pain, not because he doesn't like you or wants to wean. This too shall pass... Hang in there!
DS 1/2006 9 lb. 2 oz. 22 in.
DD 10/2008 8 lb, 2 oz. 20 in.