it is more correct to compare with the height: 100=3T：length=41 bust=64 sleeve=37.5 fits for: 90-100cm height / 2-3 Years old
110=4T：length=43 bust=68 sleeve=40 fits for: 100-110cm height / 4 Years old
120=5T：length=46 bust=70 sleeve=42 fits for: 110-120cm height / 5 Years old
130=6T：length=49 bust=78 sleeve=47 fits for: 120-130cm height / 6 Years old
140=7T：length=51 bust=80 sleeve=48 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.