Measurements:

12M
Chest: 27.5 in
Length: 13 3/4 in
Sleeve (with cuff turned back): 8 in

2T
Chest: 29 in
Length: 15 1/2 in
Sleeve (with cuff turned back): 8 1/2 in

3T
Chest: 31 in
Length: 17 in
Sleeve (with cuff turned back): 9 3/4 in