"Una ragazza carina."
Molto carino/a ('o' if you're referring to a boy, 'a' if it's a girl.)
Ragazza in Italian is "girl" in English.
"Chinese girl" in English is ragazza cinese in Italian.
"Naked girl" in English is ragazza nuda in Italian.
"White girl" in English is ragazza bianca in Italian.
"Baby girl" in English means bambina in Italian.
"Strange girl" in English is strana ragazza in Italian.
"Who is that girl?" in English is Chi è quella ragazza?in Italian.
"Fat Girl" in English means ragazza grassa in Italian.
"Pretty girl" is just one English equivalent of the Italian phrase ragazza carina. The pronunciation of the phrase -- which also may be translated as "cute, good-looking, lovely, nice-looking, pleasant girl" -- will be "ra-GAT-tsa ka-REE-na" in Italian.
Carina ragazza is one Italian equivalent of the English phrase "cute girl." The feminine singular noun and adjective may be preceded by the feminine singular definite (la, "the") or indefinite (una, "a, an, one") articles. The pronunciation will be "ka-REE-na ra-GAT-tsa" in Italian.
"It's a girl!" in English means È una ragazza! in Italian.