How should the rules of rugby be altered so the youth concussion rate decreases?

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Sources:

https://www.reuters.com/article/us-health-concussion-youth-sports/concussion-rates-highest-for-kids-in-rugby-hockey-and-football-idUSKBN0TZ2RE20151216

https://www.google.ca/search?q=what+is+a+concussion&oq=what+is+a+&aqs=chrome.0.69i59j69i57j0l4.2095j1j7&sourceid=chrome&ie=UTF-8

https://www.mayoclinic.org/diseases-conditions/concussion/symptoms-causes/syc-20355594

https://www.medicalnewstoday.com/articles/256518.php

http://news.bbc.co.uk/sport2/hi/rugby_union/rules_and_equipment/4200680.stm