The age or height is just for reference.it is according to the ordinary kids, Please choose the size by length and chest. Size information: Size-----Top Length-------Bust-------------Sleeve----------Pants Length------Advice Age S-------32cm/12.6"-------53cm/20.9"-------29cm/11.4"-------42cm/16.5"------0-6 Months M-------35cm/13.8"-------56cm/22.0"-------31cm/12.2"-------45cm/17.7"------6-12 Months L-------37cm/14.6"-------59cm/23.2"-------33cm/13.0"-------48cm/18.9"------12-18 Months XL------40cm/15.7"-------62cm/24.4"-------35cm/13.8"-------51cm/20.1"------18-24 Months Package: 1 Outfits set