Size Chart: Size---Length(Top)----Pants Length-----Bust*2--------Age Advice 70--------36 CM------------- 34 CM-----------23 CM --------0-6 Months 80--------38 CM------------- 36 CM-----------24 CM-------- 6-9 Months 90--------40 CM------------- 39 CM-----------25 CM --------9-12 Months 100-------42 CM------------- 42 CM-----------26 CM---------12-18 Months There is 2-3% difference according to manual measurement. Please check the measurement chart carefully before you buy the item.