Hey, guys! I'm new here and I recently upgraded my rats cage, but I'm a little worried the bar spacing is wide enough for my littlest one to get through. They're about 6 months old. They can fit their nose through, almost to their eyes, but they don't seem to be able to get their heads through. The bar spacing is 0.9". They seem to be fine, and they're not really trying to get out, but it still worries me a bit. Any suggestions?