it is more correct to compare with the height:
Unit:CM
90=2T:length=43 bust=70, fits for: 90-100cm height / 3 Years Old
100=3T:length=43 bust=70, fits for: 90-100cm height / 3 Years Old
110=4T:length=43 bust=70, fits for: 90-100cm height / 3 Years Old

120=5T:length=46 bust=74, fits for: 100-110cm height / 4 Years Old

130=6-7T:length=49 bust=78, fits for: 110-120cm height / 5 Years Old

140=8-9T:length=52 bust=82, 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.