I have taught kids ever since I have been instructing at our school.
The kids classes can start at around age 3 1/2 +. They have their own class (the stereotypical "Little Dragons" program), where they learn the *art*, not just a game. Yes, we play "games", but they are all games meant to keep their focus. They are also the same games that we play with the older students (adults included).
The main things that aid in success when teaching kids, that I have seen, are as follows:
1) Have patience. Be willing to listen while some 4 year old tells you all about his/her new bike/doll/other toy, or while they chatter on about "useless" stuff. Remember, it may not be usefull for *you*, but may be to *them*
2) Keep the kids class shorter. Our normal class runs about 45 minutes for the medium and upper belt classes, and about an hour ("officially", anyway) for the BB class. The Little Dragons class only lasts about 30 minutes.
3) Keep the pace moving. You should be changing what you are doing every five minutes or so. Stay with one thing too long, and the kids will start to wander. Keep it moving, and they will stay with you.
4) Find the kids that are doing it right and *praise them*! Kids like to be praised, and like the attention. If one kid is praised for his kicks and gets to demo them, then other kids will want to as well.
5) Be visually exciting and approachable. You don't have to be Barney or anything stupid.....just be *happy*. Look like you are having fun doing what you do, even if you are not. Kids are drawn to fun, and will want to have fun if you ware as well.
And finally......(for now):
6) Talk to the kids as *people*, not as *babies*. Use "yes sir" and "yes ma'am" when answering kids' questions. Don't overexplain, but treat the kids as if they are at least reasonably smart--they will step up to the plate. Remember, that's what they get at school as well; however, the MA is a different kind of learning. They should be aware of what they are learning, even if they don't know all the details.
One thing I did with our kids class recently was to hold a "superhero" class, where all kids pretended to be their favorite superhero. The kids loved it, and, amazingly to some, we got a LOT done that day.
All of us remember what it was like to be a kid, to some degree. I got pushed into a lot of things by my parents as well. I tended to do best and stick with the subjects where the instructors were like my friends, rather than like an....ugh....teacher.
Anyway, that's my 2 cents' worth.
Peace--