[adavieau]

That can be a sign that she is getting too much foremilk and not enough hindmilk. Try block feeding (feeding on the same side twice in a row) to see if getting some more hindmilk (the thicker creamier stuff) helps. It can also be a sign of a food allergy or intolerance (she might be reacting to something you consumed) the most common are dairy and soy.