Please allow 1-3mm error due to manual measurement. M Means The Standard Width and design available Make your baby more Style:Casual Fashion Party Package content:1 pair baby shoes(Not Including shoes box) If you are not sure which size or other problems please contact us to make sure you choose correct size. It is made of high materials Soft hand feeling your baby Fashion :Casual Shoe upper : Fabric Due to light or display setting please understand that there may be color difference. Gender:Girls/Boys Insole Length=Foot Length+0.8cm Sole :Rubber Size chart: Size:18/19 Recommended Age:0-6 Months Insole Length:11.5cm/4.53 Suitable For:Toddler Size:20/21 Recommended Age:6-12 Months Insole Length:12.5cm/4.92 Suitable For:Toddler Size:22/23 Recommended Age:12-18 Months Insole Length:13.5cm/5.32 Suitable For:Toddler Size:24/25 Recommended Age:18-24 Months Insole Length:14.5cm/5.71 Suitable For:Toddler Size:26/27 Recommended Age:2-4 Years Insole Length:15.5cm/6.10 Suitable For:Toddler