Article 1:
Is youth flag football safer than tackle? The results of this study may surprise you.
Conclusion: Injury is more likely to occur in youth flag football than in youth tackle football.
Article 2:
From the Mayo Clinic:
The risk of injury in youth football does not appear greater than the risk associated with other recreational or competitive youth sports.
Article 3:
An article quoting the Mayo Clinic
"Our analysis showed that youth football injuries are uncommon.
Article 4:
Injuries in Youth Football: A Prospective Observational Cohort Analysis Among Players Aged 9 to 13 Years
Article 5:
NY Times: NFL Players Live Longer Than Other Men