Size Chart:

Age:0-3 Months-----Bust*2:19cm/7.5"----Romper Length:48cm/18.9"
Age :3-6 Months-----Bust*2:20cm/7.9"----Romper Length:50cm/19.7"
Age :6-2 Months-----Bust*2:21cm/8.3"----Romper Length:54cm/21.6"
Age :12-18 Months----Bust*2:22cm/8.7"----Romper Length:58cm/22.8"

Note:
Please check the specific size description when purchasing.(1 inch = 2.54 cm)
Please allow 2-3% inch deviations for the manual measurement.