Dallin just had a really nasty runny diaper (nice and greenish yellow) it was mostly liquid as it has been for the past week thanks to antibiotics. I have been trying to get him to eat yogurt, but he's had no appetite. I have been nursing him like crazy though. This past diaper had a little bit of red in it which I am pretty sure was blood because he hasn't eaten anything red lately. Should I worry? Do I need to take him in?