it is more correct to compare with the height:
(Unit:CM)
6/70=3M/6M:length=30 bust=58 sleeve=18, fits for: 50-55cm height / 0-6 Months
8/80=9M/12M:length=33 bust=62 sleeve=20, fits for: 55-65cm height / 6-12 Months
10/90=18M:length=35 bust=64 sleeve=22, fits for: 65-75cm height / 12-18 Months
12/100=24M:length=37 bust=66 sleeve=24, fits for: 75-85cm height / 18-24 Months
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