K.L.
There was a recent article in our local paper about a newborn with blood in the diaper. Their problem was solved with probiotics. The initial diagnosis was that the baby was allergic to the mother's breast milk, but it turned out to be a lack of healthy bacteria. They went to a pediatric gastroenterologist and he solved the issue with probiotics for mother and child. Worth a try. Since your granddaughter is a little older, she could get it through feeding her a little yogurt with the probiotics in it or with probiotic tablets in her cereal. If the baby was recently on antibiotics, his healthy bacteria may be deficient. Good luck! Tell us how it goes!
Article:
http://tiny.cc/tzk1g