6-9months =size709-12 months 12-18months =size8018-24months =size 9024M =size 100 =can fit 2.5-3 YearsDepartment Name: BabyItem Type: SetsOuterwear Type: VestPattern Type: PrintSleeve Style: RegularGender: UnisexClosure Type: PulloverStyle: FashionFabric Type: WorstedMaterial: CottonCollar: O-NeckSleeve Length: FullMaterial Composition: 95%Unit Type: pieceMeasure the clothes you usually wear but not measure your body to choose size!!Anout the size and color problem，we need to clarify.First:due to different measurements，please accept 1-3cm errorsSecond:Different Computer Screen can display different colors event if it is the same color.So，please allow reasonale color difference.Thank you，Wish you a pleasant shopping in our store!