>>2015977btw this does in no way mean that you NEED to spend 4-500 bucks on a small kid's bike. You can find tons of used bikes from renowned manufacturers that you can equip with better gear and still come out much cheaper.
picrel is my younger daughter at 5 years old on a 16" HotRock. This bike had a coaster brake which was all she used, so I took off the hand brakes which were too big for her small hands anyway. I bought some fun and quick-running BMX tires and she loved it. Perfect kid's bike.