All of our jackets are custom made and yes we do build children's sizes. We are the largest provider of Stock Outboard racing jackets in the industry, which is mostly young kids racing. We can build you an offshore style impact jacket for just about any size person. You can go to my website at: www.BenHedrick.com and go to the SRP page on down load the measurement sheet form, or SRP's site has it too. www.SecurityRace.com
Let me know if I can be of any further assistance.
Take care, Ben