yeah it is totally normal, my DS1 got them bad so much so that my BIL made a comment at his christening....asking what it was. That was spot on the 6wk mark. Not sure there is anything you can do but just let them do there thing and go away. Do not scratch or pick at them as this can cause scars. My DS2 never got them and he is fully BF but DS1 was FF, so don't think that makes a difference.