My mouse Ethel about 1 week pregnant. (not noticable)
Ethel about 18 days pregnant. (very noticable - looks like she has swallowed a golf ball. She got even a little bigger than this. She gave birth to nine 4 days later)
Top view of pregnant Ethel at 18 days
Here are 4 of the litter of nine - 4 days old.
day 4 - pigment shows - this baby will have darker fur around his eye.
The below mice were born from two black and white broken marked mice - no idea where these colors came from! Or the long haired mice!