Hi!  We have not had any trouble with increased sun burns but my children don’t tolerate heat really well.  We have lots and lots of water and extra salt for them in the warm months and they seem to do ok.  I think alot of their susceptibility to sunburn depends on their skin type.  I tend to burn at first and then get very tan, my girls (both SSW CAH) are the same.  My husband (their daddy) tans from the first exposure to hot sun of the year and never burns.  Perhaps others have different experiences.  If you go to Archives and put in sun sensitivity or sunburn, it will pull up for you many other posts about this very topic.  Best of luck to you!

Tonia