i have one, and i put it under a lamp
A mini-mouse.
A newborn mouse will be unable to do anything at death since it will cease to live. You need to be more precise with your question in order to get a better answer.
Just make sure the mother rabbit (doe) is with the newborn. She will make sure the newborn kit is as warm as clothes that just came out of the dryer! When they are old enough to touch, you can feel their belly to make sure they are warm.
In a warm spot
The weight of a newborn mouse is 1-2 g.
Yes. A mouse is a mammal therefore it is warm blooded.
If it is still warm then no because it can create bacteria and harm the newborn
yes.
stamp on them to keep them warm
A baby rat is more likely to be a dark colour when it is newborn, but a baby mouse is pink.
This may not hurt the mouse. Keep an eye on it for a couple of hours to make sure.
It is not good.