DD2 is 5 wks now and for the last week or so has been making a slurpy noise while bfing, when she sucks, as if she's taking in air as well as milk. I've googled and it seems like something they SHOULDN'T DO, but I've adjusted latch etc and can't stop it. Mw has had a look and says latch is good. DD has lots of wet nappies, not fussing, no extra wind. What should I do? Is it a problem? It probably does vibrate the nipple more but I've not noticed any extra soreness.