Feelin Good Teesmens Short Sleeve Classic Fit T-shirt Classic

What are the actual dimensions of a medium shirt? Shoulder seam to bottom hem and sleeve length from shoulder seam? Same measurements for each color?

my nephew has a large scar on left side, is the bloodstain on your right or left side on the tee shirt?

What size for 13 yr old boy 120lbs 5' 4"

Is this regular fit?