The short answer: youth jerseys run from small youth through XL youth, then adult sizes take over. For a mixed team order, the usual split is more adult sizes with a smaller youth block.
How to size correctly
The safest way is to send the roster ages and counts on WhatsApp — we size the order for you from our range, so you do not end up with the wrong size mix sitting in stock.
For resellers, adult S–XXL is the steady seller; keep youth to a smaller share unless you sell into a school or club channel.