Some wildlife rescuers, as in legitimate charity workers, will wear very young orphaned baby rabbits and leverets in their bra. It's partly to keep them warm, partly comfort and also the sound of the heartbeat. These tiny babies are incredibly difficult to hand rear and need fed hourly in the early days.
I could never have fitted my human babies in my bra. Whilst none of them were huge, my boobs were, tender and full of milk. It would have made a cosy place for them though. Slings are the next best thing
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