it’s extra appropriate to check with the peak:
(Unit：CM)
70=3M-6M：size=32 bust=71 shoulder sleeve=25, suits for: 59-66cm top / 3-6 Months
80=9M-12M：size=35 bust=74 shoulder sleeve=27, suits for: 66-73cm top / 9-12 Months
90=18M：size=38 bust=77 shoulder sleeve=29, suits for: 73-80cm top / 12-18 Months
100=24M：size=41 bust=80 shoulder sleeve=31, suits for: 80-90cm top / 18-24 Months
110=3T：size=44 bust=83 shoulder sleeve=33, suits for: 90-100cm top / 3 Years Old
120=4T：size=47 bust=86 shoulder sleeve=35, suits for: 100-110cm top / 4 Years Old
Note:
1.There is 2-3% distinction in line with handbook measurement.(1 inch = 2.54 cm)
2.All measurement in cm, please word 1cm=0.3937ch, 1 inch=2.540cm
3.Please test the figures rigorously and order the fitting dimension, don't utterly rely upon the " age recommendation". It's only for reference.