Sizing fits as follows:

C/M-000 = Child size Gi/Kimono fits smaller children
C/M-00 = Child size Gi/Kimono fits children up to 4ft 0inches tall and 50 lbs.
C/M-0 = Child size Gi/Kimono fits children up to 4ft 3inches tall and 60 lbs.
C/M-1 = Child size Gi/Kimono fits children up to 4ft 6inches tall and 80 lbs.
C/M-2 = Child size Gi/Kimono fits children up to 4ft 9inches tall and 95 lbs.
C/M-3 = Child size Gi/Kimono fits children up to 5ft 0inches tall and 110 lbs.
C/M-4 = Child size Gi/Kimono fits children up to 5ft 2inches tall and 125 lbs. (A-1 adult is the next size up)