I have 8 Rouen and Rouen cross ducklings. I got them when they were just a couple days old. I've never brooded standard size ducks before ( only call ducks) and I didn't expect them to get so big! They are way to big for their brooder ( the biggest one I have!), and have started pulling each others back feathers out, and their brooder neeeds to be cleaned very often. They are 1 month old. I know you are to wait 6 weeks, but can they go out now? Its starting to get cold here ( sometimes freezes at night).