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Should I leave Rabbit in outside cage to have babies? - rabbit outside cages blueprints

We went on vacation and returned to find our rabbits (we thought we were) girls have had babies. I took the children and mothers. After that we made not to feed the child and tries to help, but they are dead? I think the reason for not feeding because she was pregnant, again? He pulls on the skin yet, I left it, and at the gates? We live in California, which is reduced to about 56 degrees at night. Thank you!