I have two 4 (well now almost 6 weeks old) baby girls in my DCN, and it's perfect! I blocked off the bottom part of the cage, so they can't have the whole cage yet. They are perfect in it, and can only stick snoots out of the bars, just barely. If it was the ferret nation, it would be different.
Thank you! I had the cage set up and ready and they seemed ok but I was a little nervous going into night time when I can't monitor them to make sure they don't disappear on me. Haha, again thanks so much!