I know that this is an old thread, but I'm really hoping this is the issue with my 6 month old daughter! She has green diarrhea with some blood everyday! I've tried block feeding, but I guess I'd never been really consistent about it. I'm also shocked to see that it took you 4 days to start seeing yellow poops! That may have been why I kept giving up on block feeding before and thought that wasn't the cause. I'd eliminated so much from my diet!!! I know she is sensitive to dairy and eggs though. I kept thinking I was "starving" her by block feeding! Thanks so much for posting this!