Child's behavior

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Updated on Feb 26, 2018
My son will be turning 4yrs next month, at school he is very shy, scared to play slides n other games and doesn't mingle with other kids and doesn't answer questions is what we get to hear from his teachers where as at home he behaves totally different he is playful, active and smart in answering all things thought to him. We are not able to understand him. Please help.