10wk old, always fed reasonably well, started to feed for a couple of minutes then scream and claw out at my boob for past couple days. I bring her back up to wind etc (nothing ever comes up though) wait for her to calm down then try again. This goes on for about 10-15mins then as all of a sudden she will feed like a dream. I'm wondering if she's getting bellyache at the start but why now? Have checked her mouth and that look as clear of thrush symptoms. Any suggestions?