Hi Sherry,

We always make sure our daughter (SWCAH age 5) has Gatorade/Propel and some salty snacks.  That seems to helps her the best. We also make sure she wears light clothes and always put her hair up so it is not hot and sweaty on her neck.  We make her sit and rest every 30 minutes or so and if possible we spray her off with a hose or water bottle.  She has never had any problems so far.