I ordered a size 9 for my son (3.5 years old), he was using a size 8 Teva Infant/Toddler Psyclone 1 Sandal and his toes had started to come out of the sandal; therefore I thought that a size 9 of the same brand would do just fine. He is actually using a 9 for tennis shoes.
Well, we went to a supermarket and after a few minutes of running around, I put my son on the cart and chekced his feet. I was checking for any redness as I do for any new shoe, and for my surprise there were blisters already!
I took the shoes off and my son remaneid barefeet until we got back home.
I do not know if it runs small or if it is just the way the shoe is built.
Since we are out of the country the time for a return has run off, but I will try returning it as defective because I can only thing this pair is defective after the damage it has done to my son's feet.
Both my son and I loved the Teva Infant/Toddler Psyclone 1 Sandal and believed TEVA is a great brand so I hope I can get a TEVA that works for him. I just changed the model to this one because it had protection for the toes what I thought could be important to use at school (he just started school).
If you are buying be careful to be able to try it and return it with time.