Wow, you act like you've had mice all your life! You're doing everything right! One thing I would say is that you should also give them lab blocks with the mix. I too use the fiesta mix but I add oxbow young rat and mouse food so they can get all the nutrients they need. I would also recommend, if possible, to get an aquarium-like cage for them instead of the critter nation type cages. Mice can actually get stuck in the tubes and bars fairly easily. I have a 29 gallon long tank with a mesh lid (needed for protection and ventilation) which is secured with cage clips. They do fine with that I don't think mice can catch your cold, but if it's bad enough you may not want to handle them too much, just to be safe. Good luck with your babies! If you have any other questions for me feel free to ask!!