it is more correct to compare with the height:
(Unit：CM)
2=5T：Tops length=32 bust=85 shoulder=47 sleeve=37 Pants length=82, fits for: 105-115cm height / 5 Years Old

3=6T：Tops length=34 bust=89 shoulder=49 sleeve=38 Pants length=84, fits for: 115-125cm height / 6 Years Old

4=7T-8T：Tops length=36 bust=93 shoulder=51 sleeve=39 Pants length=87, fits for: 125-135cm height / 7-8 Years Old

5=9T-10T：Tops length=38 bust=97 shoulder=53 sleeve=40 Pants length=90, fits for: 135-145cm height / 9-10 Years Old

6=11T-12T：Tops length=40 bust=101 shoulder=55 sleeve=41 Pants length=93, fits for: 145-155cm height / 11-12 Years Old

7=13T-14T：Tops length=42 bust=105 shoulder=57 sleeve=42 Pants length=96, fits for: 155-160cm height / 13-14 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.