4        27.5         26             60

5        28.5           27           65

6       30.5           28           70

8       32.5            30         75

for about  90-140cm baby girl(just suggest only)
the skinny baby can choose a smaller number

the model is 5T,about 104cm height ,but bust is 51.5cm,she wear the size 3 is like this ,you can have a look 

Manual measurement,there is an error of 1-3 centimeters
Please forgive!