This makes sense for very young children, for various reasons, mainly that it’s hard or impossible to diagnose ADHD with reliability at such a young age, and because medication is hard to dose properly to a rapidly growing child. But these recommendations are honestly more about helping the parents cope than about treating the child’s ADHD. Behavioral therapy is more about learning how to fit in than addressing the actual problems (which are often exacerbated by the inevitable failure of such behavioral treatment and its corresponding expectations in folks with genuine ADHD).