Gender presence in children’s books is traditionally skewed in favor of the male. As are our societies in general. However, a parent may undermine this imbalance by a simple act, i.e. by changing a “he” into a “she”.
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When my kids were small and I read Swedish picture-books for them, I occasionally pulled the same stunt. Because, for instance, who can see what gender the blue-haired mountain-gnome Plupp has?