(ABC 6 News) – In recent years, experts have raised more concerns about parents taking the fun out sports. A new study finds 70% of kids drop out of organized youth sports by age 13.

Some reasons include depression, fatigue, sleep problems and injuries.

Its recommended young athletes take part in no more than one sport per day, taking at least one day of rest per week.

“Parents can do a lot to support young people,” says Dr. Layra Erickson-Schroth, chief medical officer of at the Jed Foundation. “So, it doesn’t matter if they win or lose. It’s that they’re building their character and they’re taking care of their bodies.”

The study also recommends young athletes have two to three months off from each sport every year.