Having just the right soccer ball can make it easy to sharpen your skills each time you step on the soccer pitch. Official-sized Nike soccer balls provide a realistic feel and bounce as you move down the pitch, or choose colorful Brava soccer balls to show off support for your country's World Cup team. Pick up adidas soccer balls that highlight your love for your favorite football club, so that everyone will know if you support Man U or Chelsea.
If you are unsure of which size to get your child, I will recommend what size I think based off real-world use. The size 3 is good for any child until about first grade or second grade, which is when a child should move into a size 4. The size 4 should last until they get to middle school (around 6th or 7th grade), and then they would move into the adult official size 5.
I decided to try to contact Kan Jam, since I was more interested in the possibility of an exchange than a return. In my experience, if a company will honor an exchange, some of the time, they won't require that you send the original product back. But I couldn't find any direct contact info for Kan Jam and decided to just open up a Return Request through Amazon. I did say in the comments that I would prefer an exchange over a return, but I

Only size 5, and size 4 are available for this. Although this should not be a major problem as this is for recreational play and practicing purpose, so kids are ok to play with this as well. In fact, the ball that will be given away to the developing countries will be used by the kids mostly. If you are buying this for an adult go for size 5, and if you are buying for kids or youth players then better go for size 4.
Furthermore, cleaning the ball is a very important task that you must do on a regular basis. It could help you avoid water absorption issues, and it will help make it last longer. Clean a soccer ball with some mild soap and lukewarm water to maintain its performance. Don’t use harsh cleaning agents as this might damage the ball’s construction material. Storing the ball in low temperatures is ideal to avoid warping or water retention. https://www.youtube.com/watch?v=_TX8dExPIWc
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