Marine Blue DSD Short sleeve Leotard

Age 3-4 is size 0, Age 5-6 i size 1, age 7-8 is size 1b, age 9-10 is size 2 and age 11-12 is size 3a in this brand of leotard.  
 
(we can get a smaller size 00 which is very tiny but size 3-4 is usually small enough for my two year old dancers with pull ups.)