I have worn size 6 in big kids size before ( normally a 7 in ladies) but these were a little too big . I will order Big Kids 5 and they should be fine .Last spring I couldn't get the shoes my granddaughter wanted. Took a shot and bought a pair of these in gray(her color request). She loved them so much that she wore them everywhere. This year she requested a black shoe and squeeled when I handed these to her. She love the fact that she can where them in the water, in mud, to the mall. Easy to keep clean and don't have that plasticy smell or feel.These run a bit big. The heal is also kind of shallow. but im hoping they will work next year.As much as I love these shoes so much I am a bit disappointed that they look like this after only 5 months of use. I bought these for my son for when he plays outside. He’s played hard in them, but I do expect them to hold up if I am going to pay $40. Therefore I can only give 3 stars. We love these shoes and my son does as well, just a bit of a disappointment that they can’t withstand hard play. All in all these are great for non-rough use, going to the store, taking a walk, but hard play perhaps not so much.Seems like a really high-quality shoe - better than some of the other water shoe brands we've tried in the past.Love these shoes! Perfect for my little guys that are constantly in and out of the house to the creek and garden. They are easy for them to get on and are very comfortable. Finally a summer shoe they don’t argue about wearing!My 5yo grandson loves these shoes. He can throw them on quickly, they are soft and comfy. He can even run around at the beach or in he mud and just rinse them off. We'll be buying more!I’m so glad we found some red ones in my son’s size. He’s been wanting them for a long time. They also fit as expected. I’m nervous when buying shoes but they fit the same as his tennis shoes. He says they’re super comfortable.