In English, this is correct, "every child plays...", Jedes Kind spielt..", but in German could it also be "Jedes Kinder..."? Although incorrect in English.
No, "jedes Kinder" is wrong.
That is correct... in number agreement. And technically Jedes Kinder spielen Fussball is structurally correct, but that is just as weird as saying every children plays football in English.