I have 3 - 6 week old Bantams and I would love to put them outside but worry they are too little. 2 appear fully feathered and the other I believe is a silkie and am not sure it will ever really have feathers (never raised a silkie before). I put my standard birds in an outdoor coop at 5 weeks about this time last year. Is it ok for the Bantams or should I wait?