My New Zealand's 12 kits are 3 days old now. I'm wondering if it is really necessary or wise to put another nesting box in and separate the kits? There would barely be enough room for her to move around in the cage if I add another box. However, the nesting box she has now is about the size she is herself. Is that how it's supposed to be or should it be bigger? We got it from a friend and they may have raised smaller breeds.