What should you do if a runt mouse lives but is developing slowly?
== As soon as your mouse is beginning to eat solid food, start
to provide it with extra nutritious foods in addition to regular
mouse food. Try a little bit of scrambled egg, tiny scraps of
chicken, oily fish, porridge, and if you can afford to buy some,
try substitute animal's milk, the kind used to feed orphaned baby
animals. It's full of nutrition! Make sure the little thing is not
being bullied by it's stronger siblings too!