We do offer this rather naughty T-shirt in XS, which is equivalent to a 30-32" chest size - just right for your average 12 year old boy. We're just not sure we would recommend sticking one on your 12 year old boy - it might not please his Mom/Grandma/teacher!! This top quality shirt is US made from 100% combed cotton. The same shirt is available in larger sizes on the MENS apparel page.