The Canadian Paediatric Society’s (CPS) position statement on bodychecking in youth ice hockey discusses the issue in an Canadian context and provides recommendations to ultimately reduce injury and keep hockey players safe. One of the recommendations suggested bodychecking should not be introduced into competitive level play until the bantam level. Hockey Canada approved a rule change for the 2013-14 season which eliminated bodychecking from peewee levels and below. While the change is recent, evidence suggests that this will prevent injury in young players, including concussions.
The full statement is available on the CPS website.