My son is 2.5 weeks old and is sometimes very fussy at the breast! He tugs and bites and it's extremely painful! At nights it's the worst ! Halfway through the feeding he starts screaming! I don't think it's due to low milk supply cuz I hear him swallowing the whole time and I'm getting plenty of wet and dirty diapers! What could b bothering him?? Sometimes during the day we'll have a good feeding without him being fussy but for past two days he's been pretty fussy most of the time ... please help with any advice! Thanks!!!