Soccer balls come in different sizes. Under 6 and Under 8 use a size 3 ball. Under 10 and Under 12 use a size 4 ball. Under 14 and Under 15 uses a size 5 ball. Sewn-seam balls are typically of higher quality and will last longer. It's also good to invest in a small hand-held pump to keep your player's ball properly inflated. Please bring your ball to every practice and game. Writing your name on the ball with a Sharpie is a good idea.