Fun fact: “Das Mädchen” (“little girl”, neuter) is diminutive form for “Die Mad” (“girl”, female).
All diminutives in German are neuter, for whatever reason. You could do the same for “Der Knabe” (“boy”) → “Das Knäbchen” (“little boy”).
Curiously, saying “Die Mad” would be as uncommon – at least nowadays – as saying “Das Knäbchen”.