25Ginny Was The First Female Weasley Of Several Generations
While it's notable that Ginny was the only daughter that Arthur and Molly had of their seven children, Ginny herself was actually something of a streak-breaker. She was the first female Weasley to be born into the family for several generations. Arthur only had brothers growing up, and it was
stated that a few of the generations before Arthur were all male as well.
After the birth of Ginny, the no-female-birth curse was seemingly broken, as the next generation of Weasleys saw seven female Weasleys being born, and only five males.