I'm wondering if I should be concerned. My four girls are about 3.5 weeks old and seem to be healthy, active and happy. The only thing is that they all seem to have versions of runny poo, VERY smelly, but not necessarily at the same time. One day one of them will have normal poo, while everyone else has the runs, and then the next day it switches. Very confusing! I did start letting them out onto the lawn for brief periods to scratch around, so I was thinking it might just be the addition of new items to their digestive system (grass, ants, etc). Sometimes the poo is very reddish brown, today someone had green runny poo (I figured from the grass two days ago?) Anyway, I'm just wondering how concerned I should be about it, and if there is something I should give them?