At what age do baby rabbits start to urinate/defecate? anyone know? the bottom of the nestbox was wet tonight- the first time we have noticed this, but we haven't seen anything that looks like feces yet. We want to be sure that we keep the box clean enough, but hope to delay fooling around with it as long as possible so as not to bother the mother. We originally just put hay in the box but that seems not to be absorbent enough, so tonight we added some wood shavings.