I haven't heard of any link although some people on here have reported that their child 'goes off' the milk when you are pregnant (good luck ttc) I think it's just coincidence - I've found at that age as they become more nosy and aware of everything around them that they do have days when feeding is just too much distraction If she's off and on the breast a lot, all that fussing might have upset her digestion a bit and causing her to bring up a bit? The other option I suppose is that she's finding your supply rather heavy today and thus the feeding is a bit overwhelming? Has she had a growth spurt recently - if you've fed more and now she's wanting a bit less it might take a day or two for the supply to settle back to what she wants?