critter nation

Hello, I am fostering two small female rats who were dumped outside in Harrisburg, PA in October. There has been a lot of news coverage about the release of hundreds of fancy pet rats. They both were pregnant and had litters. I have a single level Critter Nation I bought to house the two...

I plan on getting a critter nation super soon, before I bring rat babies home. I just want to double check that the bar spacing will be small enough that the new babies won't escape. I think you can bring them home as early as 6 weeks old?