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This finding-that having more mature brains did not help the adoptees avoid the toddler-talk stage-suggests that babies speak in baby talk not because they have baby brains, but because they only just got started learning and need time to accrue sufficient vocabulary to be able to expand their conversations. Before long, the one-word stage will give way to the two-word stage, and so on. Learning how to chat like an adult is a gradual process. (Scientific American)