Size chart per North Face website...


2T - Height - 33-36in. / Weight - 29-32 lbs. / Waist 20-21in. / Arm Length 17.5 in / Inseam 13.5-14.5 in
3T - Height - 36-39in. / Weight - 32-37 lbs. / Waist 21-22in. / Arm Length 18.5 in / Inseam 15-16 in
4T - Height - 39-42in. / Weight - 37-41 lbs. / Waist 22-23in. / Arm Length 19.5 in / Inseam 16.5-17 in
5 - Height - 42-44in. / Weight - 41-45 lbs. / Waist 23-24in. / Arm Length 21 in / Inseam 18-19 in.