Can you mix a teddy bear hamster with a teddy bear hamster in the same cage?

Baby hamsters can be with its Mother hamster until they are 3 to weeks old.

If you see them fighting between 3 to 4 weeks separate them immediately.

when they are 4 weeks babies will e matured to mate and make more babies!

Matured hamsters should be left alone in the cage to avoid fighting and can put together only for breeding purposes. Only when the Female is in heat. Female will freeze when you rub its back, this is how ou know that she is in heat :)