I am very sorry to hear about your sons concussion. Unfortunately, concussions are very common in soccer. One study by Dr. Delaney - McGill University, found that 62.7% of college players likely suffer one or more concussions per season. The same author also published a study in the July 07 British Journal of Sports Medicine titled The Effectiveness of Protective Headgear in Reducing Head Injuries in Adolescent Soccer Players that found that players NOT wearing protective headgear were 2.65 times more likely to have suffered a concussion.

The issue is,like the NFL denying there is a problem in football with concussions, the soccer governing bodies are avoiding addressing the issue and not informing the players.

Injuries like your son's are happing all to often. My daughter suffered many concussions while playing soccer. The last one resulted in post concussion syndrome for more than 6 years!