We make our 11 year old take 3 months off from throwing a Baseball every year. Previous to this year it has been 3 months of no Baseball activities period but we are going let him do Batting Practice twice a week after taking a month off from hitting, but still no throwing for 3 months.... anyways yes burnout is important for them to avoid 8 years old is a good time to get them some proper instruction. I coach an 11U Travel Team, and I can tell you there are plenty of kids who get away with poor hitting mechanics who rake on Little League pitchers throwing 40-45 mph and end up on All-Star teams. But then if those same kids go to Rockford or Milwaukee for Travel Team tournaments and face the best pitchers throwing 60-70mph, they are going to strike out or hit weak ground balls a lot. They then need to really improve their hitting mechanics in order to face better competition. Let me tell if your kid is a Baseball nut and has taken 5000 swings or whatever between the age of 7 and 11 with poor mechanics, it can take a long long amount of very focused work to undo that. My kid led his league in coach-pitch 8 year olds in HR's, Doubles etc etc... "played up" in Fall Ball that year for his first year of kid pitch with 9-10 year olds and hit .000.... hit .750 in 9U Machine pitch....was 3rd on his All-Star team in 10U in hitting, batted over .500 "playing up" as a 10 with 11-12 year olds in Fall Ball Little League, all using fairly poor mechanics Now he's getting humbled in 11U Travel Ball by great pitchers. He's still getting a good amount of hits due to athletic ability but he's having to completely remake his swing in order to compete. I told him better now than in High School