How long are mice pregnant?

A female mouse will typically give birth to 42 to 60 offspring per year with five to seven mice in each litter. Gestation generally lasts 19 to 21 days. Knowing how to tell when your mouse is pregnant can give you time to prepare. read more

Female mice, or does, experience estrus -- "heat" -- every three to five days, so most does housed with a single male become pregnant within one to five days. Does housed with more than one male at a time rarely bring a pregnancy to term because male mice produce pheromones that cause miscarriage of pregnancies fathered by other mice. read more

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Mice should be weaned at 3 to 4 weeks after birth. Pups must be weaned if the same mom gives birth to a second litter. The pups should be robust, active, have open eyes, teeth and adult fur rather than the sparser fur of babies. read more