How to Say "Little Mouse" in German

Mäuschen

/ˈmɔʏ̯sçən/

The English phrase "little mouse" is translated into German as Mäuschen.

Mäuschen is used as an affectionate term of endearment for a loved one or a child.

Is there a formal and an informal way to say it?

Mäuschen is an informal term. It is used primarily when speaking to children or between romantic partners.

The diminutive form Mäuschen is grammatically neuter, regardless of the gender of the person being addressed.

/ˈmɔʏ̯sçən/

In some regions, Mäuschen can be used playfully or condescendingly if said to a stranger or a colleague to imply they are naive.
German has a specific cultural phenomenon of 'Koseworte' or 'cuddle words', and Mäuschen is one of the most classic examples of this tradition.
The use of animal names as endearments is very common in Germany, but calling someone a 'mouse' specifically implies a sense of smallness and harmlessness that is seen as sweet rather than insulting.

Unaufgeregt schlenderte die kleine Maus durch den Garten.
Unperturbed, the little mouse strolled through the garden.
Komm her, du süßes Mäuschen!
Come here, you sweet little mouse!
Das kleine Mäuschen versteckte sich hinter dem Sofa.
The little mouse hid behind the sofa.
Die Kinder kicherten, als die kleine Maus über den Boden huschte.
The children giggled as the little mouse scurried across the floor.
Dem kleinen Mäuschen gefiel der köstliche Käse.
The tasty cheese pleased the little mouse.
Komm her, mein kleines Mäuschen.
Come here, my little mouse.
Du bist mein liebes Mäuschen.
You are my dear little mouse.
Gute Nacht, kleines Mäuschen.
Good night, little mouse.

Lukas and Laura are relaxing on the sofa at home.

Sources

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