My 2 ferret were born 1st of may and i wouldnt work them untill around christmas, allow them time to mature, all my 2 do is play with each other, i dont think at this stage they will be of much use , would it not be better to take them out with a mature ferret who knows the ropes, i dont like the idea of 13 week old kits working it dosent seem right,
If you know your kits you should know the point they stop being kits & become adults, my 2 still look like kits & behave like them as well