Yes, I know that sports drinks contain fluid, carbohydrate, sodium and potassium and that these are important to get after exercise to replace losses during exercise. But, unless your workouts are really intense and really long (i.e. you're a professional or Olympic athlete) all you need is water and a small snack. Even children who play at a rep or competitive level of sport likely don't need a sports drink after the game because they're not going steady for 60 minutes or more.
That said, sports drink beverages are tasty so they may encourage your child to drink more. I still won't buy them because I don't think they're necessary and I don't like spending the money on them. What I will do is make my own version of a sports drink and this has satisfied my kids. Here's the recipe. It's really easy so even kids can make it.
What you do:
Measure 2 cups water and add to a pitcher.
Measure 2 cups orange juice and add to pitcher.
Add 1/4 tsp salt to the water/oj mixture.
Give it all a good stir.
Pour into a water bottled filled with ice.
Enjoy after your workout or game.
If there is any leftover sports drink, I'll often freeze it in ice cube trays and the kids pop the 'sports drink cubes' into their water bottle for school.
There are plenty of recipes for making your own sports drink. Simply 'google' How to make your own sports drinks and you'll find all kinds of different versions.
Enjoy hydrating your young athlete and saving money at the same time by making your own sports drink!