The North Face Sizing Chart

Boys:

Height Weight Chest Waist
XXS (5) 42-44 in 40-43 lbs 23-24 in 22-23 in
XS (6) 45-47 in 44-50 lbs 24-25 in 22-23 in
SM (7-9) 48-53 in 51-65 lbs 25-27 in 23-24 in
MD (10-12) 54-59 in 66-87 lbs 27-29 in 24-26 in
LG (14-16) 60-64 in 88-115 lbs 30-32 in 27-29 in
XL (18-20) 65-69 in 116-140 lbs 33-35 in 29-31 in