M :Tight Length 50cm,Age for 2-3Years,Height Suitable for 90-100cm;L :Tight Length 53cm,Age for 3-4Years,Height Suitable for 100-110cm;XL:Tight Length 66cm,Age for 4-6Years,Height Suitable for 110-125cm;XXL:Tight Length 75cm,Age for 6-8Years,Height Suitable for 125-140cm.Ps:waist are elastic, can adjust to different baby The suggested age and height is just for your reference. If your measurement is floating between two sizes, advise choosing the larger size.(NOTICE : EVERY COLOR may be a little difference in length,please allow 1-2 cm error)