I have a problem with losing my 4 day old kits one after another. The mother gave birth with at least her second litter (we adopted her with a litter, not sure how many she has had before then) she had 9 kits 4 days ago and today we found one dead one this morning and then two more a few hours later and just about an hour ago another one died. They are in the house because it is too cold outside and we feel so helpless. Why might this be happening? And is there anything we should be doing?