My New Zealand doe gave birth this morning. It's her 2nd litter and it seemed like she did it all right: pulled lots of fur and had them all in the nest box. I peaked in this afternoon and counted 10 warm wiggly kits. I peaked in again this evening and noticed one wasn't moving so I looked around a bit. 5 of the 10 are dead. What happened? My other doe isn't showing any signs of labor but it's day 31. It's her first pregnancy so I'm not expected a good outcome.