I'm sorry for your loss. My sister's bunny had babies too. She has 2 adult males and 2 adult females. one of the females had 4 babies, 3 died that day and the other died the next next day, I was gonna take care of the one that lived cause the mama didn't want them but he died under my care I felt so responsible for his death it still makes me sad. Then the next day her other female had 1 baby and it died too also one of the males died, I think that the other male must have felt threatened (sp?) and killed the other male. We called the vet and they said that if it's the 1st time they have babies that more than likely all the babies will die.