Baby mice are introduced to food by their mothers so you should not need to interfere in anyway unless the baby mouse doesn't have a mother. I think baby mice start to eat solid food at around 2-3weeks.
Sublimation is the transition directly from solid to gas, without the intermediary liquid stage. The reverse (the transition directly from gas to solid) is called deposition or desublimation.
yes
The heat energy, or enthalpy, associated with a solid to liquid transition is the enthalpy of fusion and that associated with a solid to gas transition is the enthalpy of sublimation.
All you have to do is freeze it.
Solidification or Crystallization
Water reaches the point of freezing when it undergoes a phase transition from a liquid to a solid.
A baby mouse can start eating a small amount of solid foods once they open their eyes at about 2.5 weeks of age. They will enjoy soft cooked vegetables such as peas and carrots as well as kitten food mixed with a small amount of water or moistened hamster food. If the mouse is being fed by its mother, it can switch completely to solid foods at about four weeks of age. If you are caring for an abandoned mouse, it should be ready to switch to all solid foods at five or six weeks.
The phase transition from a liquid to a solid is called freezing or solidification.
red solid
Phase transition
melting
The glass transition temperature is a critical point for amorphous solids, where they transition from a glassy to a rubbery state.