Disney, Y'all, they totally missed the meaning of the story. It's all about honoring motherhood and the struggles of raising young boys on your own. In the tale, they suggest that there are no girls in the group because they're too clever to fall out of their prams and wander off. That's why they're known as the "lost boys." Peter brought Wendy along to provide the Lost Boys with a female role model and mother figure. If there were already girls among the Lost Boys, then Wendy wouldn't be needed anymore.