That is very interesting about the kids and ear plugs.  I asked my son's (former) pediatrician about earplugs for my son and she told me to "just use some cotton".  Needless to say I was not impressed.  IMHO he's still too young to get anything out of going to the range or anywhere else that is inherently loud so I haven't given it much more thought but I will certainly follow your example and seek a second opinion before I do take him to the shooting range, the drag races or anywhere else extremely loud.   
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Learn to improvise everything.