Raising a kid as an International Couple in Japan

I am an Indonesian living in Japan, my wife is a Filipina and we are raising our child here in Japan. We mainly speak English with a hope that our son can be fluent in English and learn the Japanese later in Kindergarten (幼稚園).

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But somehow we have a lot of worries like “will he get stress later when everybody around him speaking Japanese”.

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If there is any advice on teaching language or your own experience, I would like to hear.

Thank you