The average child’s vocabulary when he starts school is roughly 5000 words [1]. This means that between the ages of one and five, children learn (on average) approximately 3.5 words every day. In order for this to happen, children need lots of exposure to language. And it’s not just how much children hear, but also what they hear that matters. Several studies have shown that children benefit from exposure to unfamiliar vocabulary (words they don’t hear in everyday conversations, like “damp”, “purchase”, or “frightened”)