My 6-week-old DD is sometimes very fussy at the breast, pulling off and simultaneously trying to latch on again and kneading it with her fists and crying...I don't know if it's wind (but I've tried burping her and it makes no difference), that she isn't hungry any more or if she's still hungry and frustrated by a slower flow or something. She never does it at the beginning of a feed.
She doesn't tend to do it at night (touch wood), there she feeds quietly until she's finished.
If anyone has any advice...thank you!