We have two first time mamma rabbits. Mistie had 5 kits. We keep finding the outside the nest and mamma accidentally stepped on and killed one. We keep placing them back in the nest and they seem healthy. Trixie had 7 kits. They all seemed healthy. They were born 3 days ago. Last night we found one dead outside the nest and this morning we found another. Anyone know what is happening or what we can do?