[header] How to tame a mouse [title] Feed the mice. [step] If you find mice that have been orphaned, they're probably in desperate need of food. Try to get them fed as quickly as possible. 
They'll need to be fed liquid nutrients with droppers, since they're still very young and would normally be nursing. By feeding them as babies, you're getting them to think of you as a mother, which is key to taming them from a young age.