I would have a doctor look at him. Yellow color can be liver problems and any blood in his stool should be addressed as soon as possible. I hope it's nothing serious but still worth getting him checked out.
I agree with wanabb.
Yellow eyes indicate a potential liver problem. You need to get your son seen by a doctor asap - this is not something to wait around on.
You definitely need to have a doc check him out. I had this problem last month with my son and it turned out that he had an ear infection that caused his liver to over produce which made his eyes yellow.
Why are you waisting time on here take him to the er.