My 10 week old has what I'm pretty sure is a cold sore. I've heard that cold sores can be very serious in newborn babies, but I don't know the definition of 'newborn' - for children generally, my medical book just says ignore them and they'll go away on their own. So..... it being a Saturday, my only options before Monday are do nothing or go to the hospital, which seems a bit dramatic. Does anyone have any advice??