Right now my rats are set up in totes with 1:6. I'm wanting to pull the pregnant females into their own smaller tote before they deliver, but wondering when along the way that should be done.

I don't want to make them be by themselves for too long before hand, but I do have one or two that are starting to look rather pear shaped. I can get pics if it would help, I just found myself unsure when to separate them to avoid back to back breeding.

Thanks!