Since so many things including pornography are forbidden to children until they are 18, what’s the harm in forbidding Doraemon in Hindi? You can just tell the Hindi language businessmen to export Doraemon dubbed into Bengali. Those who learn other languages before their mother tongue, that becomes their mother tongue.
Since we have a state language, as long as it was not an extinction threat, Japanese, Hindi, Urdu or Burmese language was not a problem for us. But kiddy Hindi has become a big challenge for Bengali language.