it is more correct to compare with the height:
Unit:CM
90=2T:length=41 bust=90 sleeve=38, fits for: 80-90cm height / 2 Years Old
100=3T:length=45 bust=94 sleeve=42, fits for: 90-100cm height / 3 Years Old
110=4T:length=49 bust=98 sleeve=46, fits for: 100-110cm height / 4 Years Old
120=5T:length=53 bust=102 sleeve=50, fits for: 110-120cm height / 5 Years Old
130=6T:length=57 bust=106 sleeve=54, fits for: 120-130cm height / 6 Years Old
140=7T-8T:length=61 bust=110 sleeve=58, fits for: 130-140cm height / 7-8 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.