muchachita
little girl
muchacha
girl
+
-ita
diminutive suffix
Muchachita means little girl and is composed of muchacha0 (girl0) + -ita1 (diminutive suffix1), literally meaning 'small girl'.
noun
- little girlA little girl or young girlLa muchachita jugaba en el parque. // The little girl was playing in the park.