The Recommended US size are just for reference only, as it is NOT the standard size. Please check the shoes length as standard when choosing the size, Thanks! Size Detail:US Size------------Amazon Size--------EUR Size------------Heel to Toe(Inch/CM)USA9-------------US Toddler 9M----------26-------------------6.29""USA10-------------US Toddler 10M----------27--------------------6.49""USA10.5-------------US Little Kid 10.5M--------28--------------------6.69""USA11-------------US Little Kid 11M----------29--------------------6.88""USA11.5------------US Little Kid 11.5M---------30--------------------7.08""USA12------------US Little Kid 12M---------31--------------------7.28""USA13.5-----------US Little Kid 13.5M--------32----------------------7.48""USA1-----------US Little Kid 1M--------33-----------------------7.67""USA1.5-----------US Little Kid 1.5M--------34-----------------------7.87""USA2.5-----------US Little Kid 2.5M--------35-----------------------8.07""USA3-----------US Big Kid 3M--------36-----------------------8.26""USA3.5-----------US Big Kid 3.5M--------37-----------------------8.66""USA4-----------US Big Kid 4M--------38-----------------------8.85""Note:1. The real color of the item may be slightly differently from the pictures shown on the website caused by many factors such as the brightness of the computer screen or the lighting levels;2. A slight measurement deviation within 0.5-1 cm is allowed;If we fail to satisfy you for any reason, please do contact us in time, we promise every customer with 100% fine after-sell service. We've been always trying our best to make it pleasant shopping experiences for everyone of you.