Q:

How can I tell when my female mouse is pregnant?

A:

Quick Answer

According to Fancy Mice, the easiest way to determine if a mouse is pregnant is by looking for a waxy white plug in the vulva. Excess semen from the male creates the plug at the entrance of the vagina to prevent the female from mating with other male mice.

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Full Answer

Typically, the plug stays in the female for a period of a couple of days. However, once it falls out, it can often be found in the cage. Another way to determine that a mouse is pregnant is by looking for a fuller stomach and enlarged nipples, according to Paw Nation. Nesting also indicates that a mouse may be pregnant. Generally, pregnant mice begin nesting one to two weeks before giving birth.

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