It's Asian size，please check the detail sizer on the size chart image.Material: Cotton BlendColor: BlueNeck: Turn Down CollarSleeve: Short SleevePants Length: ShortPattern: PlaidDecoration: ButtonClosure Type: Snap ButtonStyle: CasualOccasion: CasualDesign: CuteDepartment Name: BabyGender: BoySeason: SummerPlaid PatternSuitable for everyday wearNote:1. Hint for choosing proper size， use similar clothing to compare with the size.2. Choose larger sizes if your size are same as the flat measurement Size chart.Size: There are 4 sizes (70， 80， 90， 100) available for the following listing. please allow 1-2cm differs due to manual measurement， thanks (All measurement in cm and please note 1cm=0.39inch)