Why does it say in the Jewish Talmud "A Gentile girl who is three years old can be violated."-Aboda Sarah 37a?

Gentile means anyone who isn't Jewish, for those who aren't familiar with that word. That quote, and many others which deserve to be read before forming an opinion about the Jewish race. I would like to know why they believe that a little girl can be raped if she is only 3 years old?
Update: For those who deny it I'll add this quote Libbre David 37: "If a Jew be called upon to explain any part of the rabbinic books, he ought to give only a false explanation. Who ever will violate this order shall be put to death."
Update 2: This also is in the Talmud, so surely it wasn't a coincidence Yebhamoth 11b: "Sexual intercourse with a little girl is permitted if she is three years of age."
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