* Size: They'll be tiny, barely the size of a dime or even smaller, with a pink, hairless body.
* Appearance: Their eyes will be closed, and they might have a slightly wrinkled appearance. Their ears will be small and underdeveloped.
* Movement: They'll be very weak and clumsy, unable to walk or move around much. They will spend most of their time sleeping, nursing, and cuddling with their siblings.
Note: It's important to remember that different mouse breeds and species can vary in size and appearance, even at this young age.
If you're concerned about a litter of newborn mice, it's best to contact a wildlife expert or a veterinarian who can provide proper care and advice.