Beginner Students and the Three Ways to Play

I was considering how to begin with students, especially young ones of about 3 or 4, and came to the conclusion that I need to think more about when to introduce the different ways to play.  For years I've seen the wisdom in beginning the young with ear training.  This is generally done in Europe more than in America.  Especially in Eastern Europe, it is required that the child learns aural skills simultaneously with note reading.  Perhaps with older people, whose eyes and hands are more developed, starting with note reading and chord symbols first is better.   Just some thoughts (and questions too, it seems)!   I think I'll bring this up with some music teachers soon.