Blood in the poop

Hi mommies, one time my baby poop and there is a tiny blood stain then I referred it to our pedia. We conducted an occult blood test and the result is positive. I mix breast milk & formula, as per our pedia may be she is somehow allergic to her milk. I was advised to avoid high protein & dairy food and changed formula to nutramigen. We are still on our observation for 2 weeks. I’d like to know what is your idea on our situation now. #firstbaby #pleasehelp