Youth Size Chart:
 
Gildan:
XS (4-5)
S (6-8)
M (10-12)
L (14-16)
XL (18-20)
 
Bella:
S (6-8)
M (10-12)
L (14-16)
XL (18-20)
 
Comfort Colors:
XS (4-5)
S (8)
M (10-12)
L (14-16)
XL (18-20)