1) This is SOOOOO normal ... Good Housekeeping and other mother-magazines in the 1980s used to run ads that gave the number as something like 1/6 kids at age NINE. Whether this is natural or not who knows, we live in a very artificial environment ... but it is normal.
2) Just read the same question by another mom a couple of days ago. That string more than once mentioned chiropractic, which made me laugh because I never thought of it for childhood bedwetting, but I had a car accident that caused occasional (inflammation-related) incontinence until we finally pushed the right bones into the right place: pinched nerve in the sacral area, but the push had to be from the front, it was actually an adjustment meant to straighten me out for a birth.
Ok, wow, grammar has escaped me, time to move on with my morning ;).