it is more correct to compare with the height:
(Unit: CM)
L=3T：length=50 bust=74 sleeve=40; fits for: 90-100cm height / 3 Years Old

XL=4T：length=53 bust=77 sleeve=41; fits for: 100-110cm height / 4 Years Old

XXL=5T：length=55 bust=80 sleeve=42; fits for: 110-120cm height / 5 Years Old

XXXL=6T：length=58 bust=84 sleeve=43; fits for: 120-130cm height / 6 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.

Size Table 2

it is more correct to compare with the height:

L=3T：length=41 bust=73 sleeve=31 ;fits for: 85-95cm height / 3 Years Old

XL=4T：length=43 bust=76 sleeve=32 ;fits for: 95-105cm height / 4 Years Old

XXL=5T：length=45 bust=80 sleeve=33 ;fits for: 105-115cm height / 5 Years Old

XXXL=6T：length=47 bust=83 sleeve=34 ;fits for: 115-125cm height / 6 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.