I moved your thread to the sugar glider section.
I'm so sorry you lost your baby. It's hard even to guess why these things happen, especially over the internet, but if you give us some more information someone may be able to offer some advice.
I'm not quite clear - do you mean you sold/gave the glider to someone else and he died in their care, or you got him and he died 24 hours after you got him?
If the baby hasn't been buried or anything yet, you should be able to get a necropsy done by a experienced glider vet. That way at least you'd have a better idea of what happened.
I'm sorry again.
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