it is more correct to compare with the height: (Unit:CM) SIZE 110=3T-4T:length=57 bust=74 shoulder=29 sleeve=41, fits for: 105-115cm height / 3-4 Years Old SIZE 130 =5T-6T:length=60 bust=78 shoulder=31 sleeve=43, fits for: 115-125cm height / 5-6 Years Old SIZE 140=7T-8T:length=63 bust=82 shoulder=33 sleeve=45, fits for: 125-135cm height / 7-8 Years Old SIZE 150 =9T-10T:length=66 bust=86 shoulder=35 sleeve=47, fits for: 135-145cm height / 9-10 Years Old Note: 1.There is 2-3% difference according to manual measurement.(1 inch = 2.54 cm) 2.All measurement in cm, please note 1cm=0.3937ch, 1 inch=2.540cm 3.Please check the figures carefully and order the right size, don't completely depend on the " age advice". It's just for reference.