I've wondered about my daughter being intolerant of milk, and possibly soy, but until recently, I never saw blood in her stool. This changed on Saturday and today is the third day I've seen some. I saw her pediatrician today (before the third diaper) and she told me that I should only be worried if it continues for several days. So my question is should I immediately suspect an intolerance or wait it out a few more days as per my pediatrician's advice? Is there a definite way of knowing if a baby has an MSPI?

thanks!