The child is a kid

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I have always wondered who came up with the idea of calling a child a kid. I checked the dictionary and found the definition of a kid to be a young goat and the definition of a child is a young human being, therefore it's somewhat baffling as there where the interrelation between the two arises. Some may argue that young goats are very playful just like children are but there are many other young animals that are very playful. It seems this definition originated in the US and has has been adopted in many other countries with the exception of Great Britain. There are numerous contradictions between Britain and the US when it comes to naming certain subjects or objects.