Definitely check the actual Sorel website for a way better & accurate sizing! That’s what I did.My 5 1/2 year old daughter wears a 11.5 little girls shoe. Her feet both measure at 7”I got her these Sorel boots in a little girls size 12 but could’ve also probably went with the 11.5, I’m sure?The size 12 fits her perfect but with plenty of room in them for her feet to grow and even wear them throughout the year and for next winter!So I’m extremely happy about that especially for the expensive price they are. Which is also why I went with a half size up in them. Although I was worried with going up in size if they would keep her feet warm enough, fit her etc, but they definitely do!Great quality snow boots! I love Sorel!My daughter says that they keep her feet nice & dry, are comfortable, her feet super warm, not sweaty, or too hot either. Just perfect and she loves them. They are super easy for her to just step into, put them on and take off! With or without her snowsuit & snow gear on! I never have to help her with any of that ever. She wears them everyday to, at, and from school. Well worn in, my daughter definitely uses them a lot, and she isn’t a gentle or cautious one lol, and yet they still look brand new!Great quality and great buy!! I highly suggest recommend them!