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What does a pregnant mouse look like?

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Quick Answer

A pregnant mouse has a noticeable bulge in the center of its body that causes a pear-shaped appearance. The number of babies the mouse is carrying determines when the growing abdomen is noticeable. By the 14th day of pregnancy, pronounced nipples develop on the mouse's underbelly.

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Full Answer

The abdomen of an older pregnant mouse that has previously given birth may not be as apparent. This is especially true if the mouse is carrying a smaller litter. Gestation takes 19 to 21 days, and the mouse typically begins building a nest to prepare for the birth five to 14 days before the babies arrive.

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